350 mag won't stay running
Had a great day on the water today. Boat ran fine. Loaded it on the trail and brought it home to flush. Engine started fine , then after a few minutes it seemed to idle rough and early seemed to stay running, then a stall. First time in 9 years I had an issue. Went to restart. Turned the key ,heard the pump run for 5 seconds then start. Some fire but dies out. Looking for the obvious before I take it somewhere for service. Are there any driveway pointers I can try? First time the ol girl has let me down. 2004 350 mag MPI.