| What you need to do is plug the hoses/PCV holes on the valves. But 1/4 inch NPT plugs to replace the valves and some 1/2 inch caps for the hardlines. Essentially what you have now is a vacuum leak when the manifold is under vacuum. That is, air is unmetered air is being sucked into the plenum via the PCV valves, which is getting it from the crankcase, which is getting it from your vented front hoses.

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