Further to my thread on accelerator control, on my audi a3, 2002, 1.6, engine code AVU, on the black plastic intake manifold upper surface there is a black plastic disk with 2 blind holes, should this cap be loose or should it be fixed/sealed in place, i was wondering if it was allowing air into the manifold after the mass airflow and throttle body if this was causing my throttle control problem, please help....getting desperate.....oz