clutching makes my engine run faster? (help!)

[Squeegy410]

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?

[Geonovast]

Sticking IAC is most likely, but it could be an o2 sensor.

 

Pop your IAC out and scrub it down with TB cleaner.

 

Also check around for vacuum leaks.

[Squeegy410]

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

[1986Comanche]

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.

 

[Squeegy410]

anything i should know about it before i started trying to take it off and stuff?

[jpdocdave]

sometimes its held on by torx.