'89 Toyota PU, won't run when wet?

It has an "ignitor" somewhere. Usually on a fenderwell. It's a little metal box with a heat sink and usually silver green writin on it. You'll know it when you see it. There's no way to test it. In the factory service manual, the flow chart tells you to test everything else and if all that checks out "replace the ignitor". We always thought that was a hoot when I worked at the toyotee place. That's probably what it is.