hi all, i have read all the high idle posts and they have helped a little. but my problem was an iac valve. i changed that and the temp sensor. now when i start the truck, hot or cold, it revs to 2000 rpm for about 10 seconds and then idles down to 750 ish. but when i put it in gear it revs up to 1100 and likes to idle at about 40 mph. it really has me braking way too much for stop lights and signs. i show no codes and can find no vacuum leaks. any ideas?

 

oh yeah its an 04 4.0 auto 4x4