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Hello my name is ***** ***** am I speaking with?
Surging just a few hundred rpms means an inconsistance fuel flow into the engine. It can means a few different things, but starting with the most basic, when was the last time all of the fuel filters were changed on the engine? This includes the filter inside of the vapor seperating tank on the engine. This is the one that dealers usually change out.
No not necesarily
Let me ask you something else, are you boating in a lake, or in a river or bay/ocean, where there are currents?
Has the engine been into the dealer, if yes, what have they told you?