Strange Intermittent InjPW during Cranking/Running

[S-351R]

Helping diagnose a problematic 2022 Charger Whipple car with fresh install. Reportedly car would run for short time then just die.
Today, it will not start at, and multiple sessions of cranking shows 0.0000 Fuel Mass or PW. EXCEPT Once, during cranking delivered a flare of PW and she fired and ran for about 2-3 seconds, that shut due to a cut in PW.

Different tunes, original tunes, etc., all tried with same results except the one firing.

What factors would keep PW for being commanded, without codes or other clues, and yet still allow ONE firing...?

Thx for any ideas on where to check next?

?First quick fire.hpl

[f.creek-ranch]

Are you sure you got fuel pressure ?

get the injectors power supply?

[S-351R]

Yes, did confirm good FP at rail.

Have not yet checked injectors with noid light, but would seem the PCM is not ?commanding? PW vs. injectors power being interrupted.

Unless the PCM can see the feedback look?

[f.creek-ranch]

What about anti theft system ?

[S-351R]

Hard telling if something got messed up. Not obvious, but I can try disabling then IMMOB options and see if that helps.

I did validate that the TPS is not responsive to KOEO initial cycling or Pedal input. I checked another 2022 and throttle blade moves with key on and input.

Could there be a strange correlation between TPS issue preventing PCM from giving fuel (but still not throw a code)?

[f.creek-ranch]

For something like this AlfaObd would be a good tool to test the components of the system.

[Spray-Cam Hell-Ram]

Check voltage at the fuel pump controller, if controller has been removed, then at the fuel pump connector, testing voltage to ground first during priming and then again during cranking and see if there is a voltage drop between the two. Could be priming fine so rail pressure looks good, but have a voltage drop during cranking. I would test this first.