I had the same problem on my 235. When I replace the electrical harness, I found a nearly broken wire from the coil to ground. The problem went away after the new harness but I always suspected that wire.


1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.