did headgaskets on my car and had to completely retune it, guess they were leaking for awhile. anyways, timing is good, an idle..but idle seems to surge a tiny bit. it only ranges 100rpm or so at most but is annoying, also seems like i have a vacum leak from the pcv on the valve cover, you hear the line hissing at the vaccum tree an when you pinch it off, the idle drops down. i have a nasty stumble if im in any gear an just put it to the floor, if i slowly get into the gas its fine an pulls strong. it runs good but the stumble is irritating the hell out of me. fuel pressure is at 5.5psi an seems fine as i always have fuel in the filter by the carb. any suggestions? i know a vacuum leak can cause alot of things but would it cause this stumble i have? thanks in advance guys