Serial # 0G805271
1999 Mariner 135 optimax
Today when at about 3700rpm i noticed that the motor was a little shakey and the rpm was bouncing between 3700 to 3900 rpm. i didnt get any alarms at first, only after i got back to the dock did my check engine light turn on. What is weird though is that if i throttle higher than 4000rpm it goes away and i have no problem meeting my high end rpm (5500) and normal top speed. Also there maybe a little bit of something happening at idle/slower speeds but not nearly as bad as at the 3700-3900rpm range. Any thoughts, i am thinking it is a plugs/coils, fuel, or injectors issue but am not sure.