I have recently had an intake manifold replaced by a dealership, but i dont think they fixed the problem. The leak at the pcv valve seems more like a result of a bigger issue, lack of power and alot of lag in the trottle is part of it. i dont really thing the air is flowing through the engine fast enough. Has anybody had the intake manifold replace? Did they tell you why it went bad? I need help but the dealers cant do anything unless i get a code. no intake manifold leak code either.