My motor has lost power it will not turn past 4500 rpms, it has 91 hours could a fouled plug causing this? It runs fine no smoke just doesn't come out of the hole like it should and no top end. Last week it run a little rough and I figured it was the gas becuase it sat for a month and had forgot to add stabil. I added stabil after last weekend and now this. Any ideas? Also it has seemed to of lost water pressure. No messages or warning showing up on the smartcraft guages. Also I drained the water seperator on the motor and had little to no water in it.

Also what should be engine temp be running wot?