You used a shopVacc to empty your fuel tank? Holly shat!!! Your lucky you didn't blow yourself to up!!!
It sounds more like an ignition issue not water in the fuel. Water would make it run weak, slow down and shut off. Whereas an ignition issue would cause lunging like you described.
Get a gallon size fuel tank, put some injector cleaner, 50:1 Gas:Oil, and some Heat. Run the 240EFI from the tank and see if she runs smooth at an idle (only).
I suspect your problem is in the Neutral Lock or the Lanyard switches. It might even be a loose battery connector wire or some other positive lead/wire. Check all immediately. You don't want sparks under the hood!
Any way you look at it... Stop using the shopvac... we don't want to read about the terrorist attack against a Dooer!!! LOL
SpeedSter240EFI
Rj
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