[Travis]

Good morning.
I had an enjoyable last season on the boat. No Issues.
It sat in the water all winter 2 months unused, and is now off slip as of last Thursday.
Took a spin yesterday. 5 adults on board. 1/2 fuel. 3/4 water.
Engines laboured to make 3000 rpm. All gauges read normal
After 5 mins, port engine shut down without warning. Left it for 10 mins. started and manoeuvred into slip no problem.
pumping water, fuel bowls clear. Fresh fuel.
Changes made: Added 300lb generator. Painted propellors.
Any ideas on cause?

Travis