Im guessing injector or bad spark plug.. motor only needs 3 things to run, spark, gas, and compression. Gotta be one of these. When my distributor gets wet, I spray the heck outta it with WD-40 and that works for me. Wet distributor is the most common cause of missfires, but sounds like you already checked this?

Michael J. Carsner proud driver of "Aint Pretty"

37 boggers, 571 gears, Detroit+Lock-Rights, 20R stage 1 LC Engineering head on 22R motor.
MUD!!! Its whats for dinner!!