Most likely Fuel issue
I agree with Gary, although there could be problems beyond the fuel tank. I've seen similar symptoms from water in the gas. Fresh gas? Or did it sit at the marina underground tank all winter? Stabilizer added last fall? I'm thinking along these lines if you had no such problem last season, which means something new this spring. The debris has been accumulating for years and I think might have been noticeable before. I've also seen similar symptoms with a fuel pump that had issues that weren't noticeable until you try to put higher flow through the pump and it can't keep up. This may be less likely considering the association with rough water.
Please let us know what you find.
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