Constant high idle and Stalling

sorry i guess i should have stated it is the 4.7.

Smoke the intake plenumn for cracks on the under side and the vacuum port at the rear bottom.

already done, i brought it to dodge asking them to check for vacuum leaks. they performed every test they could to find a leak but there was none. if there was a vacuum leak why would the iac error code come up? im really stumped here

Because the computer has to give a reason and that is in it's programming.

Do you know what else it could be? i had taken the old iac valve and extended it ( thus breaking it) and put it back in, and it idled around 700rpm. but a few days of driving it like that is when it started stalling. so i put the new one back in and it idled high again. drove fine for a few weeks ( besides having a high idle) then it started stalling again. the connecter to the iac is getting power.

Sorry; went out to eat. I suppose you can't read live data, that would really help. Can you check the TP voltage, should be grnd on one, 5v ref, and what is the return voltage to the computer.

I will check that, and get back to you. Thank you