[mamorteguy]

I noticed on the rear of my supercharger there is type of "vacuum tree" with about 5 vacuum tubes, some of them are plugged, some are not, my question is "Are the all supposed to be plugged" or some open, and if so, which ones are supposed to be plugged? any help with this would greatly appreciated, it has a real miss between 2100 and 3000 at times, and I'm wondering if this might have something to do with it? Thankyou