hesitation

2004 270 SunDeck 496 Mercruiser HO Hey all, I just got this boat a few months ago and just started experiencing a knocking at idle and during acceleration there is some hesitation, it struggles to get on plane but once on place and running at 2700 RPM or more, there's no issues. Almost like...

Is it a difficult task to take apart and clean injectors? I'm a novice on engines, and can do basic maintenance but I've never cleaned injectors before and I believe that's a reason for my engine having issues. I've replaced the fuel filter and I'm still having some hesitation/jumping until I'm...