1991 Pontiac Grand Prix Rough Engine

Tiny
ESCOTTCARP
  • MEMBER
  • 1991 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
What can cause an intermittant rough running engne
Friday, March 19th, 2010 AT 8:44 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following-inspect and test all the following below:
1. Defective spark plug.
2. Inadequate spark/coil, defective spark plug wire.
3. Lack of compression
4. False air leakage.
5. Faulty fuel injectors.
6. Insufficient fuel pressure.
7. Contaminated fuel.
8. EGR valve that is leaking.
9. Oxygen sensors.
10. Throttle position sensor.
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Friday, March 19th, 2010 AT 9:17 PM

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