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    Aftermarket exhaust responsible for low RPM bucking?

    Thanks very much! No codes, no issues starting - fuel pump builds and maintains pressure within spec.
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    Aftermarket exhaust responsible for low RPM bucking?

    Yep, it was from the manifolds back. What did you do about it? That's exactly it, like you shifted up too early on a manual, except rough bucking/jerking. Revs seem way low at the bottom end of 3 overdrive...starts to buck...but punch it and it goes away. Driving in 3 rather than O, doesn't...
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    Aftermarket exhaust responsible for low RPM bucking?

    Has anyone replaced their stock exhaust with aftermarket and then a few months later started experiencing a "bucking" at low RPMs in overdrive? I've eliminated nearly every other culprit I can think of. No codes...I've done the torque converter test where I tap brakes with throttle open, but...
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    Random small dip in revs at idle

    UPDATE - RESOLVED - I still had the original alternator after swapping it out for new, confident that it was the source of an annoying noise I was hearing, but that turned out to be the power steering pump. Put that old alternator back in and have had no further rev dip problems since - going...
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    Delco distributor cap?

    Hey all. For the last tune up on my '99, I ordered a Delco distributor cap with part number D329A. Doesn't look like it comes up when browsing our vehicle on rockauto now, though the Delco rotor can be found there. Funnier, amazon knows my vehicle and says the D329A doesn't fit it. Confused...
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    Random small dip in revs at idle

    Update: battery, alternator, and starter check out. Sgtduckyboy's comment about idle speed reminded me that i only see this rev dip happen the engine is warm and idling low - and that it has always seemed like the idle is a little lower than it should be. 500 rpm when warm. So, cleaned the...
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    Random small dip in revs at idle

    Thanks, I appreciate the suggestion - to Autozone I go. Will report back.
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    Random small dip in revs at idle

    Hello all. 99 Yukon with 124k miles, engine and transmission are almost new - they were replaced (with stock) at around 116k or so when I threw a rod. Handful of other non-regular maintenance replacements over the last 10-15k miles, kind of as opportunities presented themselves (for instance...
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    A/C compressor is cycling even though A/C is off

    Can't believe I didn't know that. Thanks!
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    A/C compressor is cycling even though A/C is off

    I'm getting the feeling I'm about to feel very stupid. Yes, it was set to windshield defrost/defog - but the fan was set to off. I have over my entire lifetime of driving always assumed that it doesn't matter where the HVAC position control is set, if the fan level is off then nothing is...
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    A/C compressor is cycling even though A/C is off

    99 Yukon SLT. Noticed today that my A/C compressor is cycling, even though the A/C is off. Roughly every 18 seconds it goes on for roughly 6-7 seconds. Probably wouldn’t have noticed if it hadn’t been for that noise (that I can’t think of how to describe) that you hear at the front...
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    Stock exhaust replacement

    I need to wake up, sorry....99 Yukon SLT 5.7. Stock muffler shows part number 15742010, which comes up discontinued in all the usual online GM parts sites.
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    Stock exhaust replacement

    Original exhaust system giving me the putt-putt sound, believe it's time to go. Looks like GM still makes the cats but not the tailpipe and muffler - unless anyone's had any luck sourcing that assembly? New, that is....
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    Security light

    I think the compressed air-blowout did it! Hope I'm not jinxing it, but the light hasn't come back on in two days. Many thanks for the suggestions.
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    Security light

    Very helpful! I will try / use all of the above. Much appreciated. Will report back with results.
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    Security light

    '99 Yukon SLT. 120k miles. No major electrical upgrades or changes, no aftermarket alarm or remote start or anything like that, and no electrical issues outside of the usual OBS small stuff up to this point either - except now I've got my security light popping up on the dash. Every time I...
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    Trip Meter Stopped Working

    Mine has stopped on me twice, and in both cases I was able to get it going again just by resetting it and fiddling with the reset knob. What mine would do is, if you were watching it you'd see the 10th-mile indicator try to move but stop and get pushed back a little, making a clicking sound...
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    Threw a rod - parts options?

    Hey guys. Threw a rod over the weekend. Awesome. The only person I know that I can trust with my vehicle is one of the master techs at a local Chevy dealer - though that peace of mind comes at a cost. I've been able to mitigate some of the cost of his device over the years by sourcing the...
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    Door locks - fob fine, but switches no good

    so, i didn’t get any responses on this but i did resolve the issue and the solution was so strange to me that i thought it might one day save someone else here from going through the head scratching i did. i had bought a cheap cigarette lighter off amazon, cheapest i could find, just to have...
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    Door locks - fob fine, but switches no good

    No takers on this one? I know I can't be the only guy who has had this problem. Please let me know if there's anything I can do to "help you help me" or if no one is chiming in because this has already been covered exhaustively.
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    Door locks - fob fine, but switches no good

    Hey y'all. 99 Yukon SLT. Power door locks function perfectly via key fob, but not by way of any of the finger switches in the truck - driver door, passenger door, inside of D pillar. Neither lock nor unlock work. Don't know when they stopped working. Fuses in dash and under hood all good...
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    Rough 1-2 shift when accelerating hard

    Interesting, I wouldn't have thought that. But the problem was present before and after the fluid/filter change, with no detectible difference...fluid levels are fine, and no codes. X2 on the u-joints.
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    Rough 1-2 shift when accelerating hard

    Hey y’all. 99 Yukon, 4WD, 5.7L, transmission code M30. Butter-smooth shifts up and down all gears under all conditions except 1-to-2 when “accelerating in spirited fashion,” is otherwise perfectly fine when driving grandfatherly (good luck doing so in Chicago area without getting shot). What...
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    Confirming intake gasket and spider part #s

    Right on - was wondering why some earlier threads had mentioned the valve cover gaskets, you just made it exceptionally clear. Thank you! Any perspective you can offer as to the advantages of the Delphi injector unit over the AC Delco unit Rock Auto shows for my make/model and at about $60...
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    Confirming intake gasket and spider part #s

    Hey y’all - Intake manifold leak on my 99 Yukon 5.7L. Doing fuel injector spider replacement while I’m at it. I’ve looked at everything I can find on the forum concerning replacement parts and it would appear the general consensus is to upgrade to MPFI - just want to confirm the Delphi FJ10566...

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