Starting and idling problems

AJ/FormS said
Wait up, you already proved my point, when you said; "and then when it dies I lose voltage." Would it be more correct to say;It doesn't die and then lose voltage; it loses voltage and then dies.
That's probably the ASD (Automatic Shut-Down) module.I can't say what it's responding to, unless it thinks the vehicle is being stolen (anti-theft program).The priming signal does not go through the module; it is a timed computer signal,activated every time the key is cycled.
Someone else smarter than me will be along shortly to help you. Hang in there. No need for a pressure gauge just yet.
In the meantime he will want to know what vehicle we're working on.

It's in a Valiant Charger, it's a 5.7 hemi from a charger, 6spd manual with a flashed 05 ram computer and harness from hotwire auto. The car previously ran, but I was running it on a some 6.1 injectors but then I had the 5.7's professionally ultrasonic flushed and flow tested, and new caps and o-rings installed, so they are proven to be working.

So I turn the key in which it primes the fuel pump and you get 12V at the fuel pump terminals while this occurs, once it finishes priming the pump the voltage goes away until you crank it by pushing the start button. 12V is then present and remains while the car is running but then after a second or two the car just dies, whether the ASM module now has an issue? . It cranks and fires up everytime and then dies, if it was a faulty fuel pump or fuel issue i'd have thought it might have trouble starting occasionally or not fire at all but it fires as normal each time then dies. Did not have this issue before and don't remember changing anything.