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Need some help..Rough Idle

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Old Jul 8, 2006 | 12:14 PM
  #1  
89IrocZ350TPI's Avatar
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Car: ws6
Engine: ls1
Transmission: m6
Axle/Gears: 3.42
Need some help..Rough Idle

Hey guys when my car sits at idle the car seems to rev it self up a bit then drop alittle below idle. The car calls for 91-93 oct based on my mods. The other day my dad put about a 1/4 of a tank of 87 oct in the car by mistake...Not sure if that would make a difference seeing as the rest of the gas in the car is 93 oct. My second thought was an bad 02 sensor, and last thing I thought of was a bad fuel injector. Whats going on here???? Thanks
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Old Jul 8, 2006 | 12:55 PM
  #2  
IROCThe5.7L's Avatar
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From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Originally Posted by 89IrocZ350TPI
Hey guys when my car sits at idle the car seems to rev it self up a bit then drop alittle below idle.

When is the last time you cleaned the IAC?
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Old Jul 8, 2006 | 01:20 PM
  #3  
89IrocZ350TPI's Avatar
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Car: ws6
Engine: ls1
Transmission: m6
Axle/Gears: 3.42
Originally Posted by IROCThe5.7L
When is the last time you cleaned the IAC?


Your the man...Some how the plug was out from the vibrations. Thanks alot
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Old Jul 8, 2006 | 08:19 PM
  #4  
IROCThe5.7L's Avatar
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Joined: Jul 2001
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From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Originally Posted by 89IrocZ350TPI
Your the man...Some how the plug was out from the vibrations. Thanks alot

No prob, i'll take cash or money order.
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Old Jul 9, 2006 | 06:24 AM
  #5  
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From: Tampa
Car: 91 Z28
Engine: 350 TPI (L98)
Transmission: 700R4
Originally Posted by 89IrocZ350TPI
The car calls for 91-93 oct based on my mods.
I don't see heads or supercharger in that list of mods. Are you sure you need the extra octane?
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