Is the intake manifold gasket the one located on the airbox??
If so, I have replaced that circular rubber gasket.
I have replaced every visible vacuum line and rubber in the engine bay. Where else could a vacuum leak be coming from??
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
Monochromatic Paint (Custom Blue)
Flat Badged (front)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS