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First I hope you know your car when it is at a cold start has an automatic warm up system where it will rev your car up to 2500-3000 rpm until it feels the car is warm enough and slowly go back down. You can by pass this by just bleeping the gass really quickly and it should lower your idle to norma. If it still Ideas that high, check your PCV valves for leaks or cracks, I had a similar problem before.
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