Most likely not. That may be related to the negative battery cable issue. See here:I just want my car fixed, doing new valve cover and intake today, as I am not mechanically inclined. I been having service stabilitrak and misfires since October and I am HOPING these check valves and pcv diaphragm are teh cause. Can anyone tell me if misfires and service stabilitrak could be due to the pcv diaphragm or intake check valve failure?