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1999 Chevrolet Monte Carlo idle drops

Tiny
2CP-ARCHIVES
  • MEMBER
  • 1999 CHEVROLET MONTE CARLO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 79,000 MILES
1999 Chevrolet Monte Carlo mileage: 79,000. When the car is cold and I start it the idle goes to 2000 rpm and slowly drops to around 800 rpm then surges back and forth. It also seems to be skipping. If I let it sit for 3 or 4 minutes the service engine soon light comes on, but if I just touch the gas it goes off. I took it to be repaired but they couldn't find any computer codes so they cleaned and rebuilt the throttle body but it didn't help. I brought it back two more times and they replaced the 02 sensor and the EGR valve and the problem is still there. It runs fine once it's warmed up.
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Wednesday, February 2nd, 2011 AT 7:14 PM

2 Replies

Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
We suspect a faulty idle speed motor. If not done recently, a major tune up, including plug wires is in order here.
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Wednesday, February 2nd, 2011 AT 7:15 PM
Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
It sounds simple, but it sounds like a vacume leak or a weak fuel pump. If you can take the car somewere and have it smoked for vac leaks
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Thursday, February 3rd, 2011 AT 1:42 AM

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