Morning guys. Recenlty picked up a 2007 Yukon SLT 2/wd. It was a fleet veh for the company I work for and currently it has a little over 206k miles. All highway miles so the interior and exterior look amazing for the mileage. I would like to get another year of service out of it and wanted to get some advice. So far I have replaced air filter, spark plugs, cleaned the MAF and TB and ran a tank of 93 with injector cleaner. The truck runs amazing but still has a rough idle. It's worse when in drive and braking then when in park. As soon as you step on the gas it moves great and the idle doesnt fluctuate at all, you can just feel (and see when you pop the hood) the engine shaking. It was previously taken to the dealer who said it was normal. I've done a good bit of research and seen this is a common issue. The motor is very quite with no ticking so I doubt it's lifters. For what I paid I am more than willing to just deal with it as otherwise it's great. Any suggestions?
New Guy w/206k Miles
- Thread starter Rojoryu
- Start date
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guy from norcal
Full Access Member
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- Jul 15, 2012
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vaccum leak ?
Thanks for the responses.
It was taken to the dealership before I purchased it. The company was told it has an intermittent misfire in cylinder 7 (I think it was 7). But I guess its not enough to through a code??? If it is always mis-firing during idle wouldn't that throw a code? Also, why would it only misfire at idle?
Juniorss
Full Access Member
Mine started doing it to as I approached 100k, rough idle and the rpms fluctuate about 100-150rpms. Im going to chalk it up to just wear because of mileage for now. The only thing I was thinking was maybe a fuel filter? I did the plugs and wires at about 85k.
sickk23
Full Access Member
I had an 07 silverado with the vortecmax 6.0 that had a misfire at like 10k miles and it never threw a code and only did it at idle. I had just started driving and man I was afraid it was gonna die lol
