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1994 Chevy Caprice Missing, Running Rough, Backfiring once

Tiny
AARON053191
  • MEMBER
  • 1994 CHEVROLET CAPRICE
  • V8
  • 2WD
  • AUTOMATIC
  • 203,000 MILES
My problem started a month or so back. I was driving it one day and it started missing out of no where. It runs fine for about the first 10 miles of driving, or to where it is about at running temperature.

With my automotive knowledge I knew it had to be in fuel or fire.

Currently I have replaced the following parts and it has not helped any.

Coolant Temperature Senor
Ignition Coil
Throttle Position Sensor
Fuel Pump
Also, it has had a recent tune up.

I had the ignition module tested twice, both times it came back as good. Could it be wrong?

What could be causing this problem?
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Tuesday, March 16th, 2010 AT 2:21 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 listed 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.
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Tuesday, March 16th, 2010 AT 10:43 PM

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