Not a wiring issue that caused the orig part time misfiringprob but it does have a wiring issue now either full fielding (check charging voltage) or there is a dead short or very high (improper) draw (likely) under the dash that is drawing excessive current & burning the wiring. I must admit this is the most discombobulated symptomology I've ever ran into! If the condensor is still hooked up to the coil (should be on positive side if it is there) I'm gonna go way out on a limb (& K.I.S.S.) & WAG that that is it! Holler back. PS dist/cap/rotor all look good? plugs/plug wires OK? EDIT With more thought I had the exact same prob in '85 & it was the Sears white replacement HEI module (4 in a row!) and recently my coil did somewhat the same thing (but didn't you say you replaced the coil?)