rough idle

  1. iboughtatahoe23

    Rough idle/ shuddering in idle.

    RPMs seems steady, some hairline movement/bouncing but I think that might be normal. I’m having a rough idle or like a shutter every 4 seconds in park it seems like. When I put it in drive it will drop down to 500 rpm and it goes away. I have done maf sensor, throttle body cleaning, and...
  2. J-14OverlandPjct

    14 Tahoe Rough Idle + other symptoms

    Hello all, I am new to the forum and have done some digging around but am unable to find a similar discussion with the issue I am dealing with. I recently bought a 14 Tahoe 2 weeks ago as an overland build project, and have since replaced spark plugs, plug wires, air filter, oil change, and had...
  3. B

    07 gmc yukon afm block to older non afm block swap?

    ok i got this thought , maybe i could remove the afm engine and put an older 5.3 i have laying around in the o7 yukon what could go wrong. waiting for the list of problems i would get
  4. CruelJung

    Rough Idle @ Cold Crank (Worse in Cold Weather) + Fluctuating RPM in Drive

    I have seen other posts about similar issues to what I'm experiencing, but I haven't been able to glean any solutions from them as of yet. However, I've been doing what I can and collecting information over the past month, so hopefully the process of elimination has a head-start. Issue In...
    • CruelJung
    • Thread
    • cold start cold weather diablo predator 2 p0171 p0174 p0300 rough idle
    • Replies: 23
    • Forum: Engine & Drivetrain
  5. S

    Uneven Idle is getting progressively worse but cannot find the cause (Fuel Pump / Injectors?)

    Hey all, I drive a 2008 Chevrolet Avalanche (Body has 150k Miles Engine has 40k Miles...AFM sure is great) 6.0 L L76 V8 (gasoline) with a GM 4L70 transmission. I have an issue where the truck's idle has been getting progressively worse over the last few months. Issue: When at a stop the idle...
  6. J

    P0300, Service stabilitrack and rough idle.

    I’m at a loss. I have a 2011 Tahoe z71 that we purchased a month ago. Truck has 165k miles. It started running rough at idle and seemed to be getting bad fuel mileage. On cold starts it seems to run great and after warming up it gets a slight rough idle. Seems to lighten up when placed in park...
    • Joe W
    • Thread
    • engine idle misfire p0300 performance rough idle stabilitrak tahoe voltage z71
    • Replies: 4
    • Forum: Engine & Drivetrain
  7. PNWMuseumman

    6.0 Idle lope with A/C on

    I cannot figure out what could be causing this / how to fix it. The idle lop is pretty bad when the engine is hot and running the AC. I had the alternator die a year ago and changed it out, so I know it's good. Also changed the battery then. My only other thought is to change the battery cables...

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