Supposedly (as told to me by the guy I bought it from) it has a 303 cam and Explorer upper/lower intake and this "Intense Tuning" module. (please see attached pic)
All my years of fooling with cars told me it was a plug wire going bad. So, I put new plugs, wires, distributor cap and rotor. The miss is still there!
Incidentally, when I changed the plugs, all were burning that nice light tan color except #4. It was definitely darker (almost black) like it was burning more rich than the other cylinders.
Thanks in advance.