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Discussion Starter · #1 ·
why the hell does her idle surge up and down, but when it warms up she idles perfectly at around 750 rpm with out a problem, just when i let it sit over night. its an 89, long tube headers, no cats, cobra upper and lower and some other stuff. i dont understand, and its just until it warms up.
 

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Ceck the easy stuff first....idle air control....vacuum leaks..dirty throttle body....
 

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This is common, you're not alone. Check the throttle body for leaks, TPS is adjusted, IAC is clean.
 

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mine runs better cold go figure lol
 

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Discussion Starter · #5 ·
well thats the thing, if it was the iac, tps or a vacuum leak then logic would dictate that the idle would surge at all times, not just when its warming up right? . could it be a computer thing?
 

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Discussion Starter · #6 ·
whats the best way to check for vacuum leaks, or leaks around the throttle body?
 
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