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It has something to do with it either being under load or warming up. Boat runs great out of the water. I have never run it long enough as I would on the lake. I have been messing with this problem for over 5 years. Two years ago I finally broke down and sent it to a supra dealer. After getting it back from dealer. It did the exact same thing. Ran great for a half hour or so. Then shut off. It would start back up. Idle. Rev up. Run smooth. I raised the idle speed. It would run up to half throttle then start cutting out. If I backed it down it would run. Took it back to dealer. They said they put the wrong condenser on it. Got it back and it ran good for a year. Maybe ten hours. Got it out this year. Same thing. Ran good for a half hour and then died. Started back up. But will not run over half throttle. There HAS TO BE a simple answer to this. If it has spark and gas that motor should run. WHAT THE HELL AM I MISSING.
It’s a 351 Ford. I have in framed majored these motors. Which is why I boat this boat. But it seems neither I or the supra dealer can figure this out.
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Check points, dwell, Ign coil and timing to start.
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Not sure about your exact issue, but has anyone checked the fuel tank vent is clear and the hose has a loop up so water cannot get in the fuel that way. Fuel filter replaced? Fuel sample, in a clear jar and let it sit overnight...look for water at the bottom. Changing to electronic ignition was one of my best mods to my '90. I installed a Pertronix kit, about $100. Sure hope you get it figured out, and let us know what fixed it!
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Yes I did check the vent. Had it replaced. I did have a little water in my fuel filter. But not too much. Going to try and swap out coil to see if that makes a difference.
