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?