Not that one
I didn't replace the hose from the inline check valve to the intake manifold.
It looked different and in better shape than the other pieces...almost like it had been replaced before.
I'm pretty sure the place where air was coming out was around the electric valve. I crimped the hose before the electric valve and couldn't blow air through. I thought I crimped the hose after the valve and air was still coming out. Hence the question if the system supposed to be closed and if the electric valve might the the culprit.