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Hello. My name is Tan.
This is symptoms of fuel starvation. We will need a vacuum gauge, brass tee and some fuel hose. Splice the tee into the fuel supply line to the engine. Connect the vacuum gauge to the tee. Now run the boat and monitor the gauge. If it exceeds 2" of vacuum then you have a fuel restriction. This cab clogging fuel pick up tube, kinked clogged fuel tank vent, bad anti siphon valve or failing fuel line.
Do this test and post back with findings.