While on vacation, launched the boat. The first few minutes the boat performs normally. Stop, fish for awhile, restart the big motor, no problem starting. Hit the throttle and the motor starts to grumble, shake and only hit 1900 rpms. Tried restarting, and it still the same. My buddy told me it is the coil packs, I did some quick research and one of the symptoms of a bad coil pack is hard starting. Thats not the case here. Before I start throwing money at this or have a viking funeral. any ideas where i can begin? Was looking at scanners, thats not happening Thanks in advance