I just installed a set of Moroso valve covers on my 4.6, and now I seem to have excessive vacuum (to the point of not being able to pull oil cap off while the engine is running) and a strange squeal or squeaking sound at idle, certain RPM's and when you turn the thing off. It seems as if there is excessive pressure in the crankcase. The nipples on both valve covers seem to be open and not plugged. These covers came with a new PCV and hose coupling, but no directions on where to install. Anybody ever had this problem or have any ideas? I have also pulled the covers off to verify the cams or chain were not rubbing. I am a loss here!