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I did a Stage 2 cam and gear up grade about 2 years ago. Always had an idle problem and now the check engine light went on, Used diagnostic tool came up with code for Idle Air control valve cleared it adjusted idle. Light came back on and want to see if anyone has ahd similar cam related issues

2000 ZX3 2.0 auto
 

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my car about 2 months ago started revving up to 4000rpm's and wouldnt come down.every time i started it,put in the clutch,anything,it revved up to 4000rpms.then 20 min later the check engine lightcame on.i had autozone check it,and my iac valve was the problem.bought it,fixed it(which isnt an easy task)and it worked.no cel,no hi-revving.but now i have a strange noise coming from my intake.the car runs fine and still no cel with 400 miles,but the noise is there.i evengot back under there and tightened up the bolts and the noise is still there????
 
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