Got a HOLLEY problim

This is a first for me, see in the pick were that golf T is well with it plug that way it idles fine but unplug it idles up to the point it wont idles down.There is a vacume leak with it out.Whats odd after the rebuild I never notice it,I found this after the seconders were flooding a bit there was clear smoke coming out of that hole,i fix the rear float adjustment no smoke.but i have TO leave that golf T there whats up.this is a 750.