I have a 1998 Mercury 3.0 225 EFI that recently will on turn 5100 RPM. It use to turn 5800 - 5900 RPM without any problem. I have changed the plugs, fuel line, fuel filter. It does not appear to miss at low or high RPM's. I have ran injector cleaner in the last 3 or 4 tanks, but no change.
Any suggestions?