2000 Pontiac Grand Prix High idling

2000 PONTIAC GRAND PRIX
145,000 MILES • 6 CYL • FWD • AUTOMATIC
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CBUNCE87
  • MEMBER
  • 1 POST
Lately my car has been high idling and the brakes barely stop me. The rpms will go up to 3 without me stepping on the gas and my whole car shakes. This problem usually is worse or occurs most often after I : A) leave the car running for more then a few minutes B) in stop and go traffic C) or if i run errands and only have the car stopped for a few minutes. What could this be caused by?
Apr 17, 2008 at 8:46 AM
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SCOOTER2781
  • MEMBER
  • 1 POST
Sounds like either the vacuum on the brake booster or the brake booster itself is bad.
Sep 14, 2011 at 4:06 PM
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SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
Just to add to this one you can check to see if the brake booster is holding vacuum or leaking by using a vacuum hand pump pulling a vacuum on the booster and watching the gauge for a drop.
Sep 14, 2011 at 4:42 PM
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