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Showing results for tags 'carbon fouled'.
Okay so I have a 2008 GMC Sierra with 130 on a 5.3. It's my daily driver and now has some issues. Basically a misfire in cylinder 2 that I would like any good help with before I keep trying new things that might not work. So the stalibitrak and traction control lights also flash and are on regularly which started at the same time. Meanwhile the engine light has flashed for a couple seconds but is usually solid. It is a p0302 misfire. So far I have cleaned the MAF, checked for leaks, changed all spark plugs, coils, and wires, ran some seafoam through it at the brake booster line and some in the gastank. I pulled the new spark plug after it didn't work for inspection and it was very carbon fouled after 3 days and very little driving. It runs good at higher speeds but idles rough and loud I would say klunky. Has not stalled. So Does anyone have any ideas before I keep changing things that are not the problem? 2008 Chevy Silverado/ 08 GMC Sierra 5.3