why is my 98 Grand prix GTP running rough at idle and 4000 rpm
at idle the car sounds like it has a hard time runnin, sounds alot like a carburated vehicle. when it is stopped in drive it bounces foward a little. when it revs up it does the same thing at 4000 rpm and it wont go passed 4100. the supercharger made a couple of high pitched whistling noises when i was riding around and sped the car up. i recently replaced the coupler in the supercharger and a vacuum line.
In Maintenance & Repair > Engine
1 answer - 226 days ago
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