This would be much easier to diagnose if you can get the car to the auto parts store (ie PartsAmerica or Autozone) and have them run the codes, then search the forums on Taurusclub.com to see what others have found.
Otherwise, most likely culprits (in order):
EGR valve
IAC (intake air control)
DPFE - Differential Pressure Feedback EGR
This is, of course, not everything that could cause the issue. Get the codes checked and you can find out for sure.
cam position sensor has failed
i just read that the idle air control valve can stick. possibly its that.
It is always less than 20 minutes during a Hockey game because all three periods start 20 minutes
To reset the computer on a 2002 Ford Taurus disconnect the negative battery cable. Leave the battery cable disconnected for five to ten minutes. Reconnect the cable and start the car. The computer should be reset.
car start and drives fine bu when its turned off it wont start until it cools?
Check with Taurus Customer Service through their website.
cold start sensor or weak fuel pump
Does it turn over??
Lower the temperature 25 degrees and bake for 10-15 minutes. Start checking after 10 minutes.
The answer is 8, if you assume you start with 1. This makes sense, because if you think about it.Start with 1@20 minutes you have 2 (both double)@40 minutes you have 4 (both double)@60 minutes you have 8 (both double)
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.
the engine