Engine will not crank over?

Okay, I have the car listed above and it won't crank or start. I have replaced the alternator, the battery, the starter, the fuel rail, the upper intake manifold, fuses, and relays. My anti-theft system keeps preventing the car from starting. I have reset the brain, tried bypassing the theft system and have reset the settings and everything using the display button. Nothing has worked please help. I have tried disengaging the anti-theft system. I've tried resetting everything. 259,113 is the mileage and I also replaced the ignition control module. And that when I go to start it it's like it just loses all power when turning the key, but power comes back in the car after I quit turning the key.