Engine Performance problem
2003 GMC Yukon V8 Two Wheel Drive Automatic 175000 miles
Have a skip in the engine. Took it to Pepboys for a check and they said #8 coil was bad. Bought a new one, same thing. Changed plug wire and plug, same thing. Swapped #7 and 8 coils same thing
What's the next step or thing to check? I don't think it is the coil at this point. Also efficiency is really bad and getting worse. Have changed both O2 sensors and fuel filter recently.
Thanks for your help.
have the same problem?
Wednesday, September 30th, 2009 AT 9:01 PM