I have a 1997 SeaDoo GTI with the 85HP 2 stroke engine. I have owned this machine since 1999. It’s run flawlessly up until yesterday. I went for a ride and when I let off the throttle to slow down to idle it immediately stalled. The only way I could start it again was by choking it. I can keep it idling if if I pull the choke every couple seconds. I can get it going and ride it at any speed but it’s bogs when I let off the throttle or stall when I slow to idle. I have not needed to clean the carbs or change the fuel filters. Any thoughts at what the problem might be?