One problem related to automatic transmission park/neutral start switch has been reported for the 1999 Ford Taurus. The most recently reported issues are listed below.
Vehicle "surges" when accelerating at slow speeds, and when coming out of a stop; took car to dealer 2 times; they claimed that their transmission expert found nothing wrong, and asked if I had ever driven a car with an electronic shift before. When I said "no" they said that was what was wrong -- that I was not used to this kind of shift. However, I have been driving for 25 years, and have never experienced anything like this, including when I test drove the car. I am concerned that car will accidentally accelerate and injure someone.