keep getting oily green stuff in cap. It seems that the dust shield is breaking down. Its a new one. Three d. caps in 8 months. new plugs and wires.help? Let me introduce myself and ride. From salem oregon ,old enough to know but dont care.Bought car aug, 03 black/black w18 wheels. nice drive. Since purchase it's had a rough idle at times and the idle drops to 400 .Thats when i know the cap is bad {again} Have repaired some spots on the harness that were bad ,and the icv.