ok so heres the scoop. screwed plunger back on fitv. no suction when engine is warm. as far a iacv, i cleaned it and tried to adjust the idle with the idle screw, which doesn't do anything but when i back it out alot the car revs up and down so i screwed it back in like i was b4 i messed with it. so now if i unplug the iacv the car dies. on cold start my idle is around 2500 and after it warms up about 1200-1500. i going to check for vaccuum leaks in the next few days and make sure coolant is bled. but could the iacv be the root of the issue? my old iacv i had made the car rev up and down so i took my brother inlaws old iacv and put it on my car and now instead of revving up n down it just has a high idle. car runs perfect besides this.