Cylinder has spark but not firing..
i've been reading this post for a few days.....if u think it is a manifold problem i would think that a vacuum test w/a gauge would be in order.
should be a wealth of information with that gauge, and they are not expensive.
like rob said earlier, one step at a time.......sometimes on a thread like this u will get alot of info, good stuff, but sometimes too much.
good luck dude, i'm sure you'll figure it out.
higgs