what would cause my car to idle up and down when its sitting still?

Asked by Mar 09, 2012 at 09:38 AM about the 1999 Pontiac Grand Prix 4 Dr SE Sedan

Question type: Maintenance & Repair

Its gets near 1000rpm and goes down and up when its sitting still

1 Answer

225

its air flow. your mass air flow censor is trying to adjust and thats why its bouncing up and down like that. check to make sure you don't have any chokes or clogs anywhere through your airflow. make sure there is no air leaks too.

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