2003 Ford Expedition Truck hesitates & stalls

Is the check engine light on? Autozone reads the codes free, post all found.
You may have a vacuum leak, get a can of spray gumout, spray the vac lines and maniflod area, when the idle changes, youve found the leak! You want the engine running and spray on the outside but do direct the stream onto the hoses, if it is a vacuum leak, the engine idle will change speed, then you have detected a leak, repair the vacuum leak and see how it runs! If that doesnt do it, you may need a new idle air control valve, it's bolted to the throttlebody
Fords tend to leak vac at the PCV rubber elbow spray around it, Ford sells the elbow. Keep spray off the exhaust manifold.