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weird idle

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Old Nov 11, 2006 | 12:13 PM
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roblun's Avatar
roblun
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Joined: Nov 2006
Posts: 14
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From: Portsmouth, Ohio
Car: 1991 RS
Engine: 3.1
weird idle
Hi , I searched the forum and couldn't find anything that really applied to my situation. I have a 1991 RS 3.1 auto trans with about 110xxx miles and the car will idle at 750rpm fine for about 5 or 10 seconds then it revs itself up to 1000rpm for about 5 seconds, then it goes back to 750. Anybody know what this could be?
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Old Nov 11, 2006 | 04:39 PM
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Toehead's Avatar
Toehead
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Joined: Jul 2005
Posts: 2,123
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From: North Central Mass.
Car: 1985 Berlinetta
Engine: Megasquirted TPI
Transmission: Transgo 700R4
Axle/Gears: 3.42
could be the IAC being sticky
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Old Nov 11, 2006 | 04:49 PM
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2tonedmaro89's Avatar
2tonedmaro89
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Joined: Sep 2006
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From: oviedo, FL
Car: '91 RS
Engine: 5.0L gross *** tbi
Transmission: 700r4
Axle/Gears: 2.73
mine does the same exact thing! but i have a 2.8 manual trans
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Old Nov 11, 2006 | 05:33 PM
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rhomanski
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From: Arkansas
Car: 86 firebird v6,86 corvette,88 GTA
Engine: 350 C.I.,2.8l.
Transmission: th700r4
Axle/Gears: 3:08,3:27
Mine did that when the distributor module got weak.You might try that.
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Old Nov 11, 2006 | 10:57 PM
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roblun's Avatar
roblun
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Joined: Nov 2006
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From: Portsmouth, Ohio
Car: 1991 RS
Engine: 3.1
Hey thanks for all the quick responses, I'm gonna check the IAC tomorrow. and look into a distributor.
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