Idles rough

Tiny
LIBERTY275
  • MEMBER
  • 1990 OLDSMOBILE CIERA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 54,000 MILES
1990 oldes cutless ciera 3300 engine
idols rough I changed plugs wires and filters
Sunday, November 14th, 2010 AT 6:04 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be caused by one of 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. Manifold absolute pressure sensor
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Sunday, November 14th, 2010 AT 6:51 PM

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