Stand at the front of your car. Now bend over and look under the cowl that tops your radiator, you will see an EGR component with a purple line going to it, follow the purple line to all of it's intersections. You will see the air pump valve behind the motor, it's a silver cylinder held on with two bolts, check all of these vacuum lines. Pull the plastic cover over the idle air motor inspect everything there, and look by the air intake hose going into the throttle body, inspect all the vaccuum couplings and such there.