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?
Saturday, December 8th, 2007 AT 9:04 AM