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Hello. My name is Tan.
Try running the engine on a different fuel source. Your symptoms are of fuel starvation. This can be caused by deteriorated fuel lines, sticking anti siphon valve, restricted fuel vent or debris in the fuel tank. These are all part of the boat side fuel system. Then the other things that can cause your issue is a failing fuel pump or clogged fuel system. So since this is a process of elimination we can eliminate allot of issues just by running the engine on a different fuel source (5gallon gas can). THis will tell us if we have a fuel supply issue or an engine issue.
Is this something you can do?
You would have to do a compression test. The engine will have to be scanned for any faults with a computer.
From your symptoms I think you have a fuel starvation issue.
How does the engine look over all?