Ok as long as the key is held in the start position it will run but when i let it kick back to run position it dies.... Things I've replaced.....

Battery
ground cable
starter relay
starter
ecm/pcm
fuel pressure regulator
spark plugs
retimed
key lock cylinder
ignition switch
im getting 35 psi fuel pressure (while cranking and not)
I had ignition control module tested and it passed

I'm so clueless