To adjust the throttle cable you loosen the two nuts on the throttle cable (not the ones that connect to the intake manifold but actually on the cable itself) They will be straddling the bracket. Move them to one side or another and then tighten the cable back down. In your case the cable will need to be moved towards the drivers side of the car to decrease the travel of the wire. If the Rpms were too high at idle after the engine came to temp you would go the other way. Watch out adjusting the idle control valve becaus you can overtighten or pop out the screw very easily which will lead to erradic idles. The ICV is the screw on the passenger side of the throttle body. It is recessed in the throttle body and should only be adjusted while the engine is running. Just tighten or loosen it with a flathead screwdriver