Have Boat Questions? Ask a Boat Repair Expert.
There is software and a dedicated cable. It will allow the monitoring of the TPS. However what I would do first is to make sure all filters in the fuel system are clean. Next check the spark plugs, all should show a lean burn and no one plug should be grossly different. Next I would put a fuel injection pressure gauge on the top of the fuel rail. You can get a cheap one at a tool store or maybe rent one for a car parts store. Watch the fuel pressure while running and see if it drops below 35 pounds when the rpm drops.
Post back what you find.