[cotbu]

Explain what, exactly? If the op says, he has coolant lines running to the iacv? then this isn't the problem unless air is still in his system. The tricks are too force the iacv to relearn a lower airflow.

Being from the east coast I've dealt with the uncontrollable idle and repaired the issue both ways multiple times. Action depends on whether or not coolant lines are ran.

The trick is to run a restriction in the IACV line, the ecu and iacv will compensate, this take a while. Normally a few hours of driving. Will not say it's permanent!