spangs… i’m going to guess that if its’ a common studder and never runs right, it’s a coilpack… buy one and let the car idle studder, pull them one at a time and the one you pull out that doesn’t kill the car or make it worse, is the bad coil. I have some in my glovebox (lol, what a shame) so you can always borrow one.
if it’s truly a vac leak, check right off the valve cover… they are known to suck.
get some ether or something, spray around the rubber hoses and listen for engine fluctuation… that’ll be the leak… i’m sure you know that. also, under the intake mani is totally an issue!!! mine was shot a few months back
get it scanned if it drives… they can see the manifold pressue… should be about negative 22 to negative 18… or 18-22 hg/in
so… does it ever clear up? does it sound like it’s on 3 cylinders?
i’d bet coils… vac leak will typically subside if you rev it up… does it rev up choppy or does it rev up solid?
it prob is coils…i replaced two and like a dumbass didnt replace them all…
its seem choppy…and i was having the same issue and then the coild fiannly went and ran reall really bad replaced and worked so it might be one of the other two going bad…
i will see tonight…