paw paw. i have completely ruled out vacuum leaks as a possibility.
with the iac valve disconnected, and the intake holes plugged, if i turn the a/c on the problem does not happen. so the only possibilty at this point is the ecm which controls iac operation, which is not likely because ecm's rarely go bad. the other possibility is one of the many sensors that contribute a signal to idle control, and when the a/c is turned on, something goes haywire and sends the idle through the roof. the problem does not happen with the a/c off, so can i rule out those sensors and overlook them?