I had a similar problem. Turned out, the igniter case was loose and letting water into the igniter, and causing it to short out. I sealed up the case and problem went away.

I found it by taking a water bottle and misting around the engine bay until the engine sputtered. Sprayed the igniter and found the culprit.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride