There should there be a difference in idle with the IAC plugged and unplugged correct? Today i tried to set the idle as stated in the "sticky thread" in this forum, I kept trying it and it would always stay the same. So I took the bottom part (electrical part) off of the IAC and no change in idle. You could touch the plastic part sticking out and the idle would change. I tried mesuring resistance in the electrical part and it didn't show any at all. The IAC is probably the original one from 1993, do you think this coud be causing my surging idle?