Parts and labor will be about two-hundred bucks
If you remove the black plastic cover on top of the engine, you can see the valve.
Two bolts hold the valve to the throttle body.
A two wire connector plugged into it.
Try tapping the valve with a small hammer while cranking, sometimes they free up.
They stick closed and will need to be replaced.
It looks like this:
http://www.justanswer.com/uploads/HammerTi...0_IAC_valve.gif