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I'm guessing electrical fault or electronic component failure (camshaft position sensor, etc). I've seen similar before on another vehicle I owned years ago.
Fuel injector may be dirty. Put a container of fuel injector cleaner in gas tank (10 gallons) and run for awhile. May improve, I've had that problem and cleaning the injectors worked. Available for a few $$ at most auto supply stores. Worst case if that does not work may be to suspect the fuel pump and/or vacuum hoses.
All the electrical plugs should be weather pack plugs. this type of water and the low pressure of it, shouldn't get into them. If it was a lot of water, check the air filter. If it is misfiring, check spark plugs wires and or coil boots. which ever you have.
Check the ABS brake sensors in your wheels, if they are not functioning properly. It will trigger the computer to engage the ASC auto stability control light as the asc uses the brakes to assist in control. I will also engage the EML engine management light to slow the rev point to limp mode
The revving to 2000 then dropping the 1500 likely means that it is in "limp home" mode. When there is a serious problem, the car will put itself in this limited mode to avoid further damage, and to get itself back home without stalling (hence the name). Since it stalls, its likely that there is a serious problem with the fuel system, and the limp home mode will not help you any more since you keep driving it like that.
As far as the problem goes, it could be just about anything. Almost positive it has to do with the fuel system, but could be so many different things.
Hope this helps!
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