Allens292

I have a 2002 Islandia with the 240 EFI Mercury. I have been having a problem where after about 15-20 minutes on the water from a cold start and going 30-40 mph/5,000 rpm, the engine will then suddenly shut off. I have suspected an electrical problem but it does not shut off if I wiggle the key or lanyard and if I do pull the lanyard out or turn the key it will shut off instantly but start right back up. When I have the mystery stop it takes 2 cranks usually to start it again and a few seconds for the engine then to reach idle speed. Then it works fine again until it shuts off again. Each time they then get shorter and shorter until it can not exceed 2,000 rpm without shutting off. The shut-offs are instant though and do not sputter.

I have had 2 mechanics look at it and they can not seem to pinpoint the problem. Has anyone had this same problem. Canb anyone offer any thoughts?