There is no such thing as never, seldom maybe.
It should be a simple task to replace the IAC and I suppose you got the whole throttle body?
Remove the air intake hose, disconnect wire connectors and coolant hoses on throttle body and IAC. Disconnect the throttle cable and remove the 4 pcs of holding nuts and the throttle body can be removed, barring it sticking on the gaskets.
Sunday, July 20th, 2008 AT 11:41 AM