You may need to adjust the throtle or idle of the car. In older cars this is as simple as tightening a cable. So when the car is just idling it will naturally rev higher and not stall.
When there are impurities in the fuel tank, a car can cut out. Water and overheating are also common causes of cut outs.
2001 sienna stall while just stop while driving. electric just cut out power, then switch can operated but idling roughling
it still may put some voltage to keep the car running have it tested
Sonds like the idling speed is too low - it can be adjusted (Usually with just a screw driver) if you know the right screw to turn to give the engine higher idling revs.
the neatrul switch
possibly cam sensor
car cuts off
yes
The question is vague but I know a Mass Airflow Sensor issue causes the car to stall out when the gas pedal is applied like it has no power when in gear. The car may idle okay, I've even seen my friend pump the gas while it's in gear and gets the car moving but while the pedal is held down and the clutch is out the car will die.
The cause for a 1991 Ford Taurus to just cut off while driving is probably a problem with the computer. If the car will start again after about 90 minutes, then check the computer module for code errors.
Several things can cause your car to cut off while driving. Run a computer check for possible bad codes to see what may show up as a cause.