Breif RPM loss

[Shorelunch]

I was out yesterday in my boat for the first time in a few weeks. I have a four stroke motor (Suzuki DF 140) and when I hit wide open throttle, the motor would have an intermitent power loss and then it would go back to full power and then lose power again and so on. Once the motor even completely shut off while running at about 5000 RPM. I ran it for about five minutes at full power and then it seemed to run out of the problem. It never happend again for the rest of the day. Any thoughts on the problem? I filled up the tank in late April (89 octane with Seafoam) and still using the same tank.

[Norsky]

I would try to get rid of all the old gas from the tank, put in fresh stuff, and run it wide open for at least 15 minutes out on the lake. I was told not to use the seafoam as a stabilizer anymore, especially with gas that has a lot of ethanol in it.

[Wavey Davey]

I always burn premium (91, 92, 93 octane) with seafoam, although I don't have a 4 stroke. Check your owners manual/specs on fuel/octane.