My only addition to this is do not ignore the ECM or computer. My Engine surged a bunch after 20 minutes of use and viewing the injectors the fuel would sputter on one. It proved out to be the injector driver in the computer was bad. I currently run both injectors off one driver and it's fine. If this ends up being the problem and both injectors are sputtering, then a computer replacement would be in order.
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1994 MasterCraft ProStar 205
275 HP 350 Chevy Indmar
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"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams