Engine Performance problem
1999 GMC Sierra V8 Four Wheel Drive Automatic 207100 miles
My truck misses under a load, does not Miss at idle, I have varified that it is the #8 cylinder that is miss firing. I have checked the fire from the plug and wire and both are good, fuel pressure is good and I switched the injectors and coil packs from a known good cylinder to the #8 cylinder and it continues to miss fire under a load, I also just replaced a bad fuel pump and filter, when I replaced these that's when this problem started, it ran fine before the fuel pump went bad.I am out of option and don't know what else it could be, thank you for any insight.
have the same problem?
Thursday, February 18th, 2010 AT 2:34 PM