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clutching makes my engine run faster? (help!)

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Ever sence I bought my MJ it has had this problem. Some times when I start it it will rev up really high until I get it in gear, then when I clutch it it revs up again. I found recently if I push the throttle and get the rpms even higher than they are and let them fall back down it stops, but what causes this?

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sorry for ignorance but what exactly is an IAC and where would I find it?


IAC stands for Idle Air Control. The IAC is located on the front of the throttle body and to the left of the TPS (Throttle Position Sensor). Here's a picture showing the IAC and TPS. I hope this info helps.



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