no spark from time to time on 1994 Dodge Ram Van B350

Idon't know what to do next. From time to time, some times daily sometimes a day or to will pass, but always come back. Short drive long drive no matter while driving city or hiway it just shuts off, no spudder just shuts off. Then maybe an hour maybe not til next morrning it starts first try. I've changed coil,fuel firter,crankshaft sensor. I could really use some help. THANKS J2times

had same problem.coil wire fit poorly into cap got a new one and runs all the time now
1 more answer
possibly your ignition switch is failing