Then your PVC is not releasing. be it that you have changed the pvc already it tells me that the problem is behind the pvc. Just a fyi PVC means positive crankcase ventilation. So it is your problem. I would take the hose off the pvc and manifold. Plug it on the intake side. Then stick a small screw driver into the top of the pvc valve and see if you can get it to release. Typing this I just thought of something. It may sound stupid but sometimes we do odd things. Are you sure you sticking the pvc valve in correctly. Meaning its not flipped around ?
Another thing I would do is remove the flitting on the intake and check it for being plugged. Also spray some carb/brake cleaner thru it. Might want to check the hose itself for plugs as well. I am 99% positive it is a pvc related problem.
Hummm did you cold tank the valve cover ? Did you replace the gasket inside the valve cover where that plate bolts to the top of it ? The plug could also be there. Normally this isnt an issue since it has large openings for air to pass and not oil.
