I just swap out my old crx si intake manifold for a Y8 on my d16z6 and I'm getting a major vacume leak where the manifold bolts to the head. I have tried two new gaskets (honda & discount). When I spray carb cleaner I get a rough idle and bog so I know the leak is the manifold gasket. Should I have the manifold milled or dose anyone have any tips that might help me out. Thanks