2004 F-150 stall problem
 

It seems to be occasional but when I'm driving my truck it sometimes wants to stall while moving. I've replaced the fuel filter, added Lucas fuel additive and had the fuel injection system flushed. I've even had a diagnostic test done on it and still can't find the problem.
Any suggestions?

i have the same prob with my truck right now....i replaced the fuel rail pressure sensor and another sensor under the truck near the spare tire after it quit running on me completely....now it stalls whenever it wants driving or sitting still and if u give it a few mins it starts back up....is that the same thing????

The IAC valve is sticking. It is a cylindrical device near the Throttle body. Pull the two bolts, disconnect one plug, remove and clean the valve and passage in the intake.