Well we just bout a tritoon with this engine on it backed into the water fired right up let warm up, unloaded off trailer, idled over to dock, idled out to the edge of no wake zone opend it up and it fell flat on its face backed of throttle and idled fine, hit throttle fell on face. I let it try to rev and it just stumbled and reved the stumbled. then I let it idle and died. refired back up then died after that no fire again. I know imposible to diagnose but any ideas? Yes it had oil and fuel.