I noticed that the black vacuum distribution box is connected to the large flexible intake hose just before the throttle and also to the intake manifold just after the throttle. There is a lot of vacuum present on the prethrottle hose. It seems like this is causing a lot of air to bypass the throttle. Is this normal? Is a lot of air just supposed to flow from the "accordion" through the vac distribution box and into the intake manifold bypassing the throttle?