Today was very wet. Constant rain is just what
I needed to troubleshoot the intermittent electrical trouble on the
1990 Ford Festiva.
Luckily today was moist enough to provoke the problem, which is the
engine turning over but not starting, or when it does start it
sometimes stalls.
It seems like I fixed it by unplugging the main distributor wire from
the ignition coil and firmly re-seating it back into place. I drove it
all afternoon in the pouring rain with no other problems. I think I may
add a bead of silicone to the connector cover to decrease the chance of
any more moisture getting inside. The real test will be to see if the
problem doesn't pop up again next week or next month.