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What could be causing my 1993 Ford Taurus GL 3.0 V6 to shift gears on its own?

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What could be causing my 1993 Ford Taurus GL 3.0 V6 to shift gears on its own?
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What is the speedometer doing? Is it jumping around when this is going on? If it isn't, it may be a Trans Range sensor that is causing your problem instead of the Vehicle Speed Sensor.
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i own a repair shop,and it can either be a range sensor on it or a shift solenoid causing it to do this ,and if the speedometer is juming around or acting kind of strange on it id check the speed sensor also,,good luck,i hope this help,s.
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you need a new trany.
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taurus is well known for tranny problems,OD gear usually goes out,or shifting servo's,my 93 taurus was both.lots of recalls for other things also check with ford to get them all. mine was in the shop more than it was on the road. tranny rebuild here woulda been 1400. more than the car was worth. so it was junked.
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Automatic transmissions need input from the engine to work. Long ago this was done through vacuum sensors/hoses and levers. Apart from what yugie29 answered, wiggle the wiring that links the engine (near the carb/injection) and the transmission. It will probably solve the problem temporarily... Fixing the wiring connectors should be cheaper than replacing the sensors.
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