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1995 Pontiac Grand Prix RPM's go up and down

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1995 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 51,001 MILES
1995 Pontiac Grand Prix mileage: 51,000. I got stuck in a traffic jam a couple of days ago and my car did something it never has done before, it felt like it was going to stall. The rpm's kept going up and down. Then the next day while driving normal I had another problem, I think is related. When I drive at a steady speed, say 50 mph, the engine has a constant vibrating that makes the car shake. The only way to stop the car from shaking is to step on the gas to increase the speed. Also, something I just noticed during this time was that my exhaust makes a putt-putt sound while the car is in park and running. Are these three separate problems or interrelated? Any help on this matter I would appreciate. Could a tune-up possibly remedy any of this?
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Wednesday, October 20th, 2010 AT 6:19 PM

2 Replies

Tiny
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  • MEMBER
  • 4,542 POSTS
Your car may be ready for a major tune-up including spark plugs, plug wires, distributor cap, rotor, fuel filter and air filter. Also, perform a fuel pump pressure test and a compression check. Clean fuel injection system including throttle bore, idle speed control motor and passages. If problem still exists, scan computer for trouble codes.
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Wednesday, October 20th, 2010 AT 6:22 PM
Tiny
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I'm having the same exact problem. Did you figure out what it was?
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Saturday, August 6th, 2011 AT 1:56 AM

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