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Monte Carlo & Lumina Since the 1970s, the Monte Carlo has been an icon of American stock car racing. A 4-door version, the Lumina, was produced in the late 90's.
Platform: A-, G-, & W-body

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Old 02-23-2009, 04:44 PM
Junior Member
Join Date: Oct 2008
Posts: 2
Angry 99 chevy lumina idling very irregular

Hello all, hope all is well- i have a 1999 Chevy Lumina 3800 model, with 254k miles on it. Ive recently been having problems with the idle- basically, whenever i would come to a stop, with the car in drive, the RPM's would slip from 800-1000 sharply down to 400, then back up to 900-1000. My lights would dim, and the engine would sound as if its about to stall out. that occured for about a week. also, when i would come to a stop, then go to accelerate, the engine would buck and the RPM's would ruise and fall quickly. When i would shift into park, the rev would go to 1500, then fall all the way down and stall the car out.

I took my car to my mechanic, and he replaced my fuel filter and fuel pump, saying i had no pressure. ($600 total to repair) i get the car back the other day, and its still doing the EXACT same thing.

I am just wondering if anyone has any advice (besides junk it lol) or has similar experiences as to what could be causing this.

Thanks in advance for any and all help!
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Old 02-27-2013, 09:58 PM
CF Beginner
Join Date: Feb 2013
Location: Da Bronx!
Posts: 5

I had the same issue and it was my IAC motor (idle air control).
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Old 03-12-2013, 07:03 PM
CF Beginner
Join Date: Aug 2009
Location: Millbrook, IL
Posts: 25

I would find a new mechanic, first off.

It could definitely be a problem with the IAC, or also a dirty MAF (Mass air Flow) sensor. It could also have a vacuum leak. In my experience with those 3800s, they are pretty tough to kill but miles and age catch up with the little wearable items.
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