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PCM 454 7.4L Stalling after gets warm and won't start back till cool

Austinalaaa

New member
I have a 1990 Supra Saltare with a 454 7.4L. When I run the boat either in the drive way or on the lake after about 20-30 mins it will just stall out like u turned the key, and will not start back until it has cooled of 20 mins or so. I have replaced alternator, rebuilt carb, ballast resistor, coil, and ruled out a fuel problem after that. I don't know I am stumped. Any ideas or help would be great!!
 
Has spark even after shut down and plenty of fuel flow from carb. Is there some kind of sensor or something that could be bad and heat up to cause shutdown?
 
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