[hughfewingjr@gm]

I have a large volume vacuum leak in my valve cover. I have replaced the crankcase ventilation/AOS with a new one. When I disconnect the valve cover side hose on the AOS I still have vacuum in the hose and no vacuum in the valve cover. Is there something else I am missing? Is the fitting that enters the intake manifold to which the AOS line is attached a potential problem? It has a sensor in it, can that make a difference? The other option is that I have purchased a bad AOS with a torn diaphragm. Any ideas/suggestions would be most appreciated.