2004 Expedition runs great but after 2 or three stops it will not start up again
 

It runs fine but then will take a day to start again ??? Could it have something to do with the security system??? Please help

What does the anti theft light do when you turn on the key an attempt to start the vehicle?

It comes in for a second then turns off like normal

I believe that would eliminate the anti theft system.

We need to confirm that we either have spark or not at the time it will not start.
If we have spark, good possibility fuel supply problem. If no spark,need to do checks of crank sensor, to confirm it is sending signal to computer