2020 DF70A running rough

[rar2023]

Had 200 hour service March 2024 that included changing water pump and thermostat. On start, the audible alarm sounds as expected prior to starting engine. Engine starts fine and runs fine at low speeds. Recently, on acceleration, engine sputters. I thought this was fuel related and cleared Fuel/Water Seperator. Helped a little and appeared to have some water in fuel. Dumped fuel and cleaned tank thoroughly. Same scenario when running at 3,500 RMP or on acceleration. Got a new fuel line and new 3 gallon tank. Ran fine for a day. Began sputtering again on next outing. Getting an appointment at authorized dealer asap, but was hoping for some ideas. Additionally, I spend about 90% of my time putting around creeks. It's not that often that I open the boat up. Boat runs fine with low idle so I have have been experiencing this issue and not noticing it.