My 2009 People 250 with 8000 miles on it has always run perfectly. Today....I was cruising at about 45 mph, when the engine just shut down. I could start back up, but, if I didn't keep a little throttle on, it just kept shutting off. So...slowing down to a stop sign or red light would a shut down as well. It restarts, but keeps shutting down? What is the problem?? Thank you!@