01 xstar started running rough and hard to start.
I just bought an 01 xstar has 470 hours. Ran fine on test drive. Today filled it up with 93 octane, sea foam and blue stabil, went to lake today and pulled youth group from church around on a tube. Half way through the day the boat cut off while idling, then was hard to start. It did this the rest if the day, sometimes idle was fine other times it cut off and didn't want to crank back with out giving it a lot if throttle.
Where do I start? Fuel? Carb? Plugs?
I think I want to put new plugs in what the parts store plug number ?