This may not be the problem but I had a neighbor back in the 70Æs that had a little Toyota 4-door sedan. On rainy days, it would not start no matter what he did. I asked him when it started doing it. He said after a tune-up. I asked him what he did on the tune-up and he said I changed the plugs, points, condenser, rotor, dist. cap, and spark plug wires. All were aftermarket stuff. Well sense it was rainy season he had the car towed to Toyota. They did another tune-up replacing all the aftermarket stuff with OEM stuff and he never had a problem after that. When he asked them why it did it with the aftermarket stuff, they said it did not quite fit right and was allowing the whole ignition system to short out!!!!