Its an electrical issue. Water is still somewhere shorting out a sensor or shorting out the ignition. You did not suck water into the engine. If so, you would have hydro-locked that first time you tried to start it...
As a side note, if a vehicle ever dies in deep water, pull the plugs BEFORE you try to crank it over the first time. It may save your engine.
Two Trackers 4WD Club
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Wheeling in West Michigan for over 35 years.