WHEN IDLING AND APPARENTLY ONLY WHEN USING ...

  • Tiny
  • Anonymous
  • 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?

Wednesday, November 7th, 2012 AT 4:40 PM

1 Reply

  • Tiny
  • saturntech9
  • Expert
  • 29,421 posts

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

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Wednesday, November 7th, 2012 AT 5:50 PM

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