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in my 2000 gt my car will fequently idle up and down from 2,000 to down to about 200 n even die sometimes and in the mornings when i crank it specially when its cold its worse. it will quickly rev to about 2500 and die immidiatly once or twice and then idle really low for a few minutes... I had been told several times that it would be the IAC valve but when i plug in the scan thing at auto zone its not showin up a code for anything
 

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it still may be the iac.....also check for vac. leaks....
 
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