LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Idle issue

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Old Feb 26, 2012 | 06:44 AM
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Default Idle issue

I just did a rebuild and a cam swap I have a tune from a smaller cam swap and both have a issue u can be driving the the road fine an every once in a while u push in the clutch an it stays revved up at 2000 rpm for a little while an then when stopped for 10 seconds or so it will idle down what could this be
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Old Feb 26, 2012 | 07:12 AM
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sounds like some kind of vaccum issue to me, but Im not the 6speed expert, all my cars are auto. I will say though, you WILL want to get it tuned for the cam thats in the car.
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Old Feb 26, 2012 | 07:19 AM
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Ya I'm getting a dyno tune in a week or so
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Old Feb 26, 2012 | 07:21 AM
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An u would think if it was vacuum it would do it all the time but it doesn't just once In a while
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Old Feb 26, 2012 | 08:17 AM
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I have a similar issue with my 96 TA, I have traced every component to the throttle body and no success. I did put a small spring on the throttle spring to the radiator hose clamp and the seemed to fix it, but I dont like rigs. The one thing that was a constant was the throttle body. I cleaned it real well but it still does it. It is like the blades are not closing all the way and it can be annoying, hince why the extra spring. If you figure something out pleas let me know.
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Old Feb 26, 2012 | 08:50 AM
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It's not like a steady idle at 2000 rpm it goes up an down from like 1900 to 2100 rpms
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Old Feb 26, 2012 | 09:02 AM
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Mine also. But if I tap the gas it will sometime go back to 1500ish, You may have a IAC issue but that is usually a bigger RPM swing. Is your car a traction control car?
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Old Feb 26, 2012 | 09:24 AM
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No I don't have traction control
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Old Feb 26, 2012 | 01:44 PM
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i have same problem with mine. pisses me off like no other because it only does it every now and then but the symptoms are the same idle jumps around from like 1200 to 2000 for like 15 seconds then theres no problems let us know if you figure out the problem
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Old Feb 26, 2012 | 03:53 PM
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Ya it's dumb I hope someone on here as had the same problem but fixed it haha
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Old Feb 26, 2012 | 03:59 PM
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Vacuum leak or the throttle position sensor?
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Old Feb 26, 2012 | 09:32 PM
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I sprayed the entire top of my engine and all related parts and no change in idle. Also a vaccuum leak would be more consistant, either cold or warm or all the time, not a day or week or longer between episodes. Mine has done it as close to back to back stop and go to not doing it for a month, the only help was the spring.

Mabe it is the return spring on the throttle spring, attached to the throttle body??? Just an idea...
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