[Z U L8R]

that is for the the idle air control valve regulator valve. it regulates the air that goes to the iac. it's the goofy looking thing that mounts i wanna say right by the oil filter cooler. where that blue plug plugs on is black, it has a little plate on the side of it where it mounts with two 10mm bolts, and the actual thing is a square shaped guy with vacuum bungs on both sides and the long tail out the back that has the black portion where the blue plug plugs to. basically it bypasses the throttle body by getting air from a port on the intercooler piping BEFORE the throttle body, then the other end goes AFTER the throttle body and connects to the iac, it's a little valve that opens to let more air in, and closes to let less air in. it's whole function is to assist in cold starts =]