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1989 Pontiac Bonneville runs rough

Tiny
BOSTWITCH
  • MEMBER
  • 1989 PONTIAC BONNEVILLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
My engine runs rough and has a loss of power.
Some people say its a fuel module?
Some people say its ignition coil ?
some say its computer problem

Where in the world do I begin without spending a ton of money trying to eliminate every possibility?
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Tuesday, August 17th, 2010 AT 9:50 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

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.
11. Idle air control valve.
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Tuesday, August 17th, 2010 AT 10:21 PM

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