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Hello Bob. My name is Tan.
Have you checked for spark when this happens? The most common thing is fuel starvation or ignition failure.
Ask him if he checked for fuel starvation? Did he check for spark when the engine was acting up?
Did he run the engine on a different fuel source to eliminate the boat side fuel system?
Sounds like a fuel issue.
What did he do to resolve the issue? Get him to explain what he did and why?