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Q:

won't idle on 1999 Ford Expedition

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Won't idle after it gets warm.Will crank but won't keep running.
(2) Answers
(2) Comments
Is the Check Engine Light on? If so codes will be stored in the computer of your car and these codes will indicate where the problem most likely lye, (a scan tool will be needed to retrieve the codes using the diagnostic socket under the dash). Vacuum leaks or idle speed control motor are the most likely problem or something that fails because it absorbs engine heat.
The check engine light is continually on while the engine is running?

Like Patrick said, there will be codes to pull if this is the case. Have a diagnosis performed.
To supplement Patrick - if there is not a check engine light on and there are no codes, a good fuel pressure and volume test should be performed. I have seen several of these trucks that have fuel pump issues. Low fuel pressure usually does not set any codes on this one.