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Do you know what octane fuel the engine is running on?
Have you noticed a whistling sound from the engine at all?
Do you know any of the history on this engine?
Ok, there are a few things that can cause this kind of problem on this engine. There were several bulletins over the years that should have been completed on the engine. A few items for you to look at are;
The clamps on the front of the engine that hold the throttle body on. They should be stainless and not rusty. If rusted, this could allow excess air into the supercharger.
The rubber boot on the MAP sensor. This is on the rear left of the engine when looking down from the boat. There is a sensor there with 3 wires going to it. Inspect the rubber boot for tears.
The 2 knock sensors located behind the charge air cooler. They are mounted directly to the block. Make sure that they both are still tight.
Let me know what you find.