Mechanics

SERVICE ENGINE LIGHT

2002 GMC Envoy

Engine problem
2002 GMC Envoy V6 Four Wheel Drive Automatic 106000 miles

The service engine light intermittently blinks and seems like engine is misfiring, smell of sulfur, rough idle, more gasoline used than normal. By sometimes adding gas treatment, runs normal; spark plugs changed yesterday; ran steady for about 20 miles and began symptoms again. Can you help?
Avatar
Johnjeand
December 8, 2007.



Check out the related content below while we wait for the question to be answered by a professional mechanic.