I just bought a gp 1200 the guy said it ran great I took it to the water and it does not run as he said the ski kept cutting out and it kept going 2 cylinder to three so I took apart cleaned the carbs there was some gunk in them put new spArk plugs in checked to make sure there was good spark so I took the ski out again and it ran way better but after a couple minutes riding it once again started going from 2 cylinders to 3 does any one have any advice I would really appreciate it I just want my new ski to work thanks