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Sounds like a dirty or malfunctioning IAC as Billybob mentioned. Best thing to do is to see if there are any codes stored in the computer. I can only assume that the CEL (check engine light) comes on when it dies. There should be some indication in the computer codes as the the source of the problem. If you have a Haynes manual the procedure for pulling the codes is there. If not check www.fordfuelinjection.com. This will eliminate a lot of guesswork when trying to troubleshoot the problem.