Question about 2002 Chevrolet Silverado 2500HD

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I have a 2002 Chevy Silverado 2500HD with 6.0 V8 engine that is idling rough. On dianostics it showed cylinder 2 misfire. Plugs, wires, fuel filter, and #2 cylinder coil pack have been replaced. Truck is still rough while at an idle and no codes show up on dianostics now. Any ideas where to go next? Also, truck runs worse after it has cooled off like overnight or after not running for 2 hours or more.

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Sounds like coolant is getting into the combustion , i would start with no2 cyl , its a place to start, could also be a leaking injector,

Posted on May 05, 2010

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It sounds more likely to me that you have a leaking intake manifold gasket. That explains the running worse cold. Its a common problem for the gaskets to leak, the original gaskets are black with red seals, the replacements are black with green seals.

Posted on Apr 03, 2015

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