i have a '86 bronco with the 351W in it that i bought about a month ago and been messing with. well it idles rough but smooths out a higher RPM so i changed the plugs, wires, cap, rotor, ran some seafoam through it, and did some oil flushes and it still ran rough. it has a edelbrock 1406 carb on it so i got the instructions and adjusted the carb properly and still ran rough. today i ran propane over all the vac. hoses and no change in idle but when i hooked up the vac gauge to some vacuum lines with it running it still reads 0. the only place i hooked up to that had vacuum was where the brake booster goes into the manifold and has that tee off that was capped, and the gauge only read 15. so i know i have a vac leak and what i really need to do is replace all the lines but i'm intimidated with the cluster of hoses. Do i really have a vac leak, or intake leaking? why wouldn't the propane test work if i had that bad of a leak?