'83 Toyota pickup start trouble in cold, wet weather

I’d still think spark problem, ether is easier to ignite than gasoline. Try a heat source like a trouble light with an incandescent bulb and leave it near the coil or distributor during wet spells. That will drive off any condensation. A heat gun if you have one or a small space heater could be used also.

When you locate the part that when warm and dry cures the no start then you’ll know what to replace.