Mercury 50 hp two stroke 2001 triple cylinder

by Dan
(Prior lake Mn )

2001 50 hp two stroke mercury three cylinder. I am having issues with motor cutting out and then not starting. Right now I am scared to run pontoon on lower idle cruise speed around 1000-1300 rpms. If I leave it at 2600 rpms it will run all day but then after awhile it will cut down to 2400 rpms. Sometimes too if it starts to quit I will give it more throttle and it may or may not keep running. If it does keep running it takes about 5-10 seconds and then will take off. If I go wide open it does not seem to be having any issues then. I did put in a automotive type of inline filter that is a between the primer bulb and the connector to the engine. There was some black pieces of plastic that spit out of the gas line when I removed the connector that goes to the motor. That’s why I put in the filter. I am running 92 octane non oxy fuel. Thinking maybe the fuel line should be replaced and also new plugs for a faster and better start up? Any suggestions for my issues thanks ahead of time!