Mechanics

PONTIAC G5 ENGINE PROBLEM

2009 Pontiac G5 • 75,000 miles

When idling, and apparently only when using regular gasoline, I notice my car pulses back and forth almost, as if the motor is having difficulty. Engine light comes on, but when I switch to premium it all goes away. Thoughts?
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Guest
November 7, 2012.



What octane fuel does it say to use in the car?Also what are the exact code numbers not code descriptions are in computer?

Saturntech9
Nov 7, 2012.