After doing some research on this subject and that trouble code, signs point to the fuel pressure regulator. I believe this is located inside the fuel tank on the taurus. I believe you have a "returnless" fuel system. Meaning there is only one line coming from the tank with no return line. The pressure regulator in the tank can fail causing fuel pressures to go sky high. That will cause fueling issues which can stall the car or cause it to run badly.
Based on the information you provided, I think this is the best place to start. Good luck.
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the code was 0191
The code was P0191
I have not heard of a common problem with this on Fords or Taurus'. I can further help if you can clarify the issues and post a trouble code.
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