Asked in Ford Taurus
My 99 Taurus only runs for twenty minutes and will not start until it cools off why?
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):
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.