Quote Originally Posted by Capiton23 View Post
all the pcv is a one way check valve that allows the manifold to pull vacuum from the crankcase. it you put the thing in AFTER the pcv, and it has a breather, you in essence created a giant leak
x2 since you put a filter on the catch can you created a vacuum leak causing the car to rev high. and there is no need to use a T on the hose coming out of the pcv. it should go PCV-catch can-intake manifold. get rid of the filter on the catch can and your problem will be fixed.