Part number 11. Be careful not to lose or damage the O-rings. Better yet, buy new ones before you remove it. (There are actually 2 IAC's. 99% of the people will remove and clean out part number 11 and not do the same with the other one, which is part number 20 in the illustration, and tougher to get at.)
You will also need to do the idle learn procedure after you get it back together.