Drove my car thru 12" of water

I'd spray WD40 on the wiring harness connectors and make sure water did not soak the air filter . Did the check engine light come on ?

Water possibly gotten into the fuel?! Ck battery in RE to clicking upon start

hydrolock,take all spark plug off then crang the car till all water gone inside the cylinder chamber,then put all back together and hope nothing major damage.

you may have poor ignition wires that need to be replaced or a bad electrical connection that is affected by water either for the ignition system or the fuel injection system. just some places to look.

could be a number of things ' i'd suggest getting the OBD codes read by a reliable mechanic this will indicate the switch/sensor or circuit causing the issue

Check cables must be tight at battery & starter. You must have 12 volts coming out of battery to starter.
Pull your dip stick is it over filled or milky looking. If so you very likely have water in engine.
Can you turn the fly wheel or is the engine locked up?
Drain the oil replace filter remove spark plugs turn engine backward to unlock engine. Drain fuel and replace fuel filter. Remove air filter has it gotten wet? Now crank it over with Air filter & spark plugs out. Now put in new air filter spark plugs dry wires & coils. And start the car, If car starts don't drive drain transmission change filter. If it did not start you may have done damage to computer or wiring.
But you got to see if engine is locked up if 12 volts is to starter & that no water is in oil or fuel.

bad batt or alternator could be why or you could very well have a ground some where

it is a problem w/ignition wires put a NEW not used set of wires and it should run fine even after you dry old wires the problem that you have will not go away had the same problem with 850 turbo NEW IGNITION WIRES should solve your problem

sounds like your break booster is not working. you might have a major leak of vacume there. no vacume at booster and break pedel will be hard. that will also make it feel like it dosent have any power. chk. vacume filter in line going to booster see if pluged, if its got one. if not then i would say booster is bad.

there is a TSB (technical service bulletin) on this issue , with directions to install foam weatherstrip to the AIP.(air intake panel) . TSB #06-06-04-048b
J5