I have a 2000 G.C. 4.7. Every time I start the Jeep, it goes to 2,000 to 2,500 r.p.m. Even when it's warm. I replaced the IAC,didn't help.

 

wrong section bud.

 

Look for a large vacuum leak.

 

Did u clean the TB good where the Iac goes in? Could be carbon build up not leaving it seat the whole way.

 

Try the throttle position sensor. My idle went down from ~2k to 500 rpm. $30 and 5 minutes and done. My did give symptoms at highway speed though. On cruise at ~65-70 it would revv up like it had dropped down into overdrive eventhough it hadn't.