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Discussion Starter #1
my idle on my 90 5.0 ho has been really rough lately surging and watnot.....well today i played around and reset my idle and discovered that my car idles almost perfectly without the iac plugged in. as soon as you plug it in it surges almost to 3000 at sometimes...should i replace the iac or could it be something else?
 

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Run the codes first. There could be an underlying problem.

Also check for vac leaks.
 

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Have you done any work recently to the car? maybe you forgot something?? My buddy had a idle problem and went to the junkyard got a IAC off a grand Marquis works fine idle is smooth as can be. Only cost 6$$$ ....good luck
 

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You should try to figure out what the problem is rather than just unplugging the IAC. Usually if it runs better with it unplugged, the valve could need cleaning or replacing. The wires leading to it could also be the problem.
 
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