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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
With a fuel injected engine when you open the throttle to start all this is doing is giving the engine extra air, it does not give extra fuel until running and the tps then tells it where the throttle percentage is at and thus you either have too much fuel at that point or some other problem, starting fluid seems to also suggest a lack of fuel or too much air vs fuel, honestly for this problem and for the other engine check engine light you need a scan tool/scan software to diagnose these problems. If the vessel had been sitting with old fuel then the tanks should be drained and filled with new fuel, possible work around of fuel conditioning and or fuel system cleaning. You'd also want to observe fuel pressures during the problems.
Thank you!- Joe
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