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FIRST - check the air filter. Is it wet? A lot? Enough water through the intake can blow the engine. Since you could start it, you may be OK. Mine, after a similar experience, was damp for the bottom 1/3.
Second - be aware of wheel bearing damage.
Third - the idle problem. The idle speed is controlled by the IAC, Idle Air Control. It's controlled by the ECU, which reads engine speed and tells the IAC how much air to allow through.
BUT - the IAC is not even in the loop when the throttle is opened just a little. The throttle position switch is what tells the ECU to kick in the IAC for idle control.
Something in that system has quit working.
Try this: Engine idling at whatever speed, use a large pair of pliers to gradually close off one if the hoses to the IAC. The idle speed should drop, and if you close the hose entirely the engine will die.
If you get that result, it is the IAC system that's at fault.
Engine off, use an ohmmeter to check for continuity between all the pairs of contacts on the IAC. I thinks your model has three wires, check 3 pairs.
An open pair = dead IAC. All oK? Listen closely at the TPS as you open the throttle, can you hear the switch trip?
Beyond that all, you may have water in the harness somewhere, or something else entirely.
The ignition control module, ICM, is near the windshield washer fluid reservoir, look for water there - but that might not affect idle speed. The ECU is in the cabin - and if water rises to its level you will be afloat in an economically totalled car.
Good Luck,
Bob
:>)
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