1987 Ford Bronco has a miss throughout drive range. Lacks p

Starts fine but after you first crank it, it starts running very rough, like it is miss-fireing. Changed plugs, wires, rotor-button and distributo cap, coil and coil-wire, replaced #2 feul-injector because that seems to be the cylinder that isnt fireing, or is fireing, just not at the right time. I've also replaced the feul-pump in the tank, feul-filter, and feul-presure-regulator, and it has a new computer. It seems to run a litle better, but it still has that miss and it still lacks power. My question is what else could it be? Or what else do I need to check? I consider myself pretty mechanicly-inclined, but this one has me stumped.