I am betting it is your ignition switch- it is just like any other type of switch, in that it has contacts that eventually wear out. Once you turn the key to start the car, it returns to a position that maintains the contacts to power your accessories, and it sounds like those contacts inside the ignition switch are worn or broken. The "acc" contacts when you turn the key backward are rarely used so they are still in good shape, unlike the "run" contacts which get hit every time you start the car.
SOURCE: windshield wipers
The fuse panel is under the instrument panel to the left of the steering column. Lift the handle to unlatch the panel and pull it down. The windshield wiper/washer system uses a circuit breaker in position #2 in the fuse panel. If your washer is working the circuit breaker is OK.
SOURCE: 1990 Ford Taurus GL windshield wipers park in the wrong position
I have a 1996 Ford Taurus with a similar malfunction the intermittent wiper function is erratic, but the wipers park properly. I'm the original owner & this malfunction was in the car from the factory. I have a regular Ford Dealership manual & came to the conclusion that the Generic Electronic Module located behind the fuse panel is bad (computer glitch in programming) ! Ford Dealers want over $ 300.00 for a brand new module, I haven't checked with my local used auto parts recycler yet, but I know it will be less than the dealer price !
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