Starving for air at idle. Rpm's drop under 500 rpms then dies

Maybe it is time to replace the idle air control valve.

Thanks I'll try that

you might also have the catalytic converter checked, it might be clogged...that is if it's not the IAC. You can also test for a clogged conv by removing the precat O2 sensor and drive the PU and see if the problem changes (yes it will be loud but if the cat is clogged, it will relieve pressure on the upside of the cat exhaust/or take it to a muffler shop, they usually check such things for free)...if you're so inclined.

its not the catalytic converter. I changed everything from the engine back last year. Its either the fuel pump even though it starts fine. Its only when the engine warms up that it drops down like its about to die

That's usually the most obvious, so with that aside, I would next pull the intake air temp sensor, it could either be bad or coated in oil (if the plenum seal is bad). Try cleaning it, mine had that and many other CEL problems, but the stalling problem was due to a dirty IAT sensor. I cleaned it off and the stalling problem went away 100%. O' course, I had to do a hughes mod on the plenum plate as well, but the IAT cured the stalls for me. Good luck!

Did u ever fix it?

My 07 4.7 did this when I had my K&N on and threw a CEL then I reverted back to stock and acts the same but without the CEL.