Intake Manifold

Plug the PCV at the carb, pull the oil cap off and see if you see suction on the valve cover. If the intake is leaking internal you can feel it. Also have you installed a vac gauge?

I have spayed a slight amount of card cleaner in the valve cover to, not much though, if there is an internal leak WITH the PCV discounted it will rev up the engine.

:thumbup: