When I start it cold it idles at 1500 rpm for several minutes before it idles down.takes about ten minutes to get down to 700 rpm in drive.Its been like this since I got it last june.
Dave

 

Tough to say but it could/should take that long. couple minutes total from 1500 down to normal idle speed is ok. Of course, the colder it is initially/outside, the longer it will take.

 

It acts that way in the midle of summer also,allthough not as long, it still takes a few minutes.I dont like putting it in gear at 1500(700r4).And I cant see sitting arround 5-10 min. waiting for it to idle down.

 

dont know if its much help, but right now, my car takes less than 5 seconds to drop idle.

in the winter it could take a minute or two, but not 10.

i think you have something wrong near/on the tbi. tps? linkage? vaccum? map?

 

In cold weather it can take as long as you stated in order for the idle go down (or go in closed loop).

In warm weather it can take a few seconds to maybe 2-3 minutes to do the same.

If you think there is something wrong, then check all sensors that would affect the idle

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92 Camaro RS LO3, 5-spd, T-tops
Performance:
SLP 1 3/4" Headers (Coated by Paul Barry Motorsports), Flowmaster Catback Exhaust, Fastchip Performance PROM, Centerforce Dual Friction Clutch, Xact 8mm wires, Open Air Element w/K&N Filter, Z28 Grille w/aftmkt fog lamps
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, Edelbrock performer intake

 

My 92 RS does exactly the same thing. 305 TBI. I have replaced The Ox2, Inlet air temp, and coolant temp sensors with no change. Other wise runs fine. I guess it's "normal"


Bear Tracks

 

i agree with snflupigus. my car idles at 1500 for like maybe like ten seconds then it drops to about 700 rpms in park. then at 500 in drive. if you have an open element, make sure you plug the necessary fitings up. that could screw your idle up

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Steve
88 Firebird TBI,TH700R4 - Open Element, Cat Delete, K&N filter 14*4 element, Dynomax Catback Exhaust, 160 Stant thermostat
1/4: 16.1@85.7 (Bone Stock)