My '91 Park got the same way. Have somebody investigate the crank sensor, which
is somewhat below the water pump. If the water pump leaks onto that sensor,
then it craps out and either fails altogether or else it fails intermittently
when a certain engine temp is reached. Replace the sensor.
Which motor? My crank sensor is on the back of the block.
Sounds like it's that, though. Same symptom for me... it was the crank
You can test for spark while it's not starting. I bet there is none.
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