You probably got intermittent elec shortage somewhere in the engine bay & underneath the car. A nice dry-out in the sun is the least you can do since you're in FL.

Let's imagine what happened when you hit the 1-foot puddle at 50MPH, First the water will gush into the grille, through radiator & fan, into engine bay. The first impact to the electric connectors would probably be CPS, VANOS solenoid and MAF, etc. I will check on every connector to see if there's any water residue. Going further back, O2 sensors, Throttle connector, DISA connector, etc.

If you let me guess, I'd say MAF, but that's just shooting from my hip.

Good luck!

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01' 3.0i E53 (M54) with 164,000 miles
07' 3.0si E83 (N52) with 134,000 miles
08' 3.0si E70 (N52) with 91,000 miles