2002 225 four stroke

[Kilgariffm]

Stumbles at 4200 RPM. Idles great accelerates to 4000 ok. Feels like misfire, stumble, busting out, bucking, no power above 4200. Replaced vst filter. Changed number one injector (plug was wet fouled). Ran on fresh gas from 5 gal can.

I am new to the post. Any help would be great.

[99yam40]

hook up to computer to see if everything looks OK, monitor fuel pressures at problem RPM, and maybe have all injectors tested/ cleaned if all else is good