I have a 95 Merc 225hp 3L Offshore carbed motor serial # 0G200991. I've been having intermittent problems with this motor since late spring.
The first problem happened after a few hours of trolling. I went to go put the boat on plane and pull back the throttle for cruising range at 3500 RPMs and the motor would not run at 3500, it would either lose RPMs or flat-out die. It ran fine at Full Throttle and at idle but not in the middle.
I replaced all of the fuel lines from the racor fuel filter to the primer bulb to the fuel pump to the motor filter and to each of the three carburetors. I also rebuilt the fuel pump which definitely saw a better days. I also changed the plugs. I also checked the stator and it was to spec.
Today I took the boat out, it jumped on plane no problem, I ran about 4 miles, then I stopped to scan a spot. Went to go put the boat on plane and I could not get the engine past 2200 RPMs. It was definitely running rough like there is a miss. I tried multiple times and could not get it past 2200. I was able to idle back to the boat ramp without a problem.
Maybe I need to check the coils? I'd appreciate any advice.