I don't know what there is to adjust on it, besides the idle screw. If that's what you mean, I've heard the procedure is to disconnect the battery for about an hour, back the screw most of the way out (not out of the IACV, until it is about flush with the top), unplug the IACV, reconnect the battery, start the car, and then screw the idle screw back in until it is idling about right, then reconnect the IACV. I'm not sure that's the exact method, but I think it is close. As for the IACV, I think you just clean it with carb cleaner and hope that solves your problem. Or replace it, but most of the time it is just gunked up and cleaning it will get it functioning again.