[Average Joe]

I dont mean to throw you a curve ball here, but I had a similar situation in my last truck. It would stumble randomly. In the beginning it appeared to be doing it under load. I replaced fuel filter and pump to no avail. I then rebuilt the carb. Still happened sporadically. IIRC I tried a known good coil. Still no luck. Eventually I traced the problem to a crappy splice in the main power wire coming from the battery, via the small distribution block on the passenger fender, to the fuse box. I soldered and shrink wrapped the faulty splice and was back in business.

Years later I had a similar problem in my Suburban. I traced it back to a loose bulkhead on the backside of the fusebox.