I have a 1995 gmc c1500 4.3 v6. Started running rough in the rain and died. Would start but backfire through the throttle body. Changed cap and rotor. Started rn good. now backfires again. ICM?

im guessing you changed the cap and rotor after the incident so it should be clean and dry i would double check all your spark plug wires if you are leaking spark thru a wire it could be transfering to another plug wire firing a cylinder off at the wrong time. if you want to blame the icm (the points right?) i would make sure they look nice and clean and no excessive movement not to mention the shaft it is on