Had a friend with a foutain that had a similar problem, drove him crazy checked out everything he could imagine. Turned out to be a screw throught the side of the boat from the rub rail hitting a wire.

bajalion has a good point. Eliminate as many possibilities as you can before changing parts. That can get expensive.

What year and type of ignition system?

had a similar problem and it turned out to be clogged fuel filter.

Had same problem on 1st boat I ever owned. If landed hard, the engine stopped. If crossed big wake, engine stopped. Turned out to be the ignition switch also. If I had boat idling and smacked the dash hard by the switch, the engine stopped. Replaced switch and problem was solved

Update....
 

Well, after essentially tearing apart every connector on the boat, I started over from scratch. Everyone tells you its usually something stooopid and it was...

BAD GAS!

I thought I had ruled that possibility out as I had just put on a new Fuel/Water separator. I thought wrong. There must have been a ton of water in my tank, becaue the new one was filled with water.

I am guessing what was happening is that water was getting past the fuel water separator and into the combustion chambers, causing detonation under load conditions. This was tripping the knock sensor, causing the boat to momentarily shut down. I might be wrong on this theory, but with some drygas, some fresh gas, and a new fuel watrer separator she is back to running like a champ.

Now if only the rain would stop.... rain at 74mph hurts!


Woodsy Von Idiot

Glad it was simple!!!