Mechanics

GMC ENVOY ENGINE PROBLEM

2004 GMC Envoy

Engine Mechanical problem
2004 GMC Envoy 6 cyl Two Wheel Drive Automatic 78000 miles

I have a 2004 GMC Envoy XUV. I have noticed that sometimes while sitting at the light with the AC running or not running, I will loose power and the car shut off. I have changed my fuel filter and starting using 89% octane gasoline to see that that will help but it didn't. What do you think the problem may be?
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Cathy Davis
August 24, 2010.




Has the check engine light come on? Have you checked fuel pump pressure? Have you checcked for vacuum leaks?



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