The adjustment screw is on the throttle body. It is preset at the factory and shouldn't need to be adjusted unless you have done a major change on the engine.

Look below the cruise control linkage bell crank and you can see it. Standing in front of the car, it will be on the left hand side of the throttle body, waaayyy down there on the front of the intake manifold where the air plenum connects to the manifold. It uses a locking nut (I believe it is an 8mm but it might be a 10mm) and a long, thin, straight bladed screwdriver for adjustment.