1991 Chrysler Imperial

I've got a 1991 chysler imperial, it will run for a sec then shuts down, I
have replaced the fuel rail, resealed the injectors, replaced the TPS, The
fuel pump relays, auto shut down relay,fuel pressure reg. is new, fuel pump
is working and replaced the coil D.I.S pack. still can't get it to run,
unless I pump the throttle then it will stay running, but its spits and
sputters, and backfires.

 

What is the fuel pressure and volume?

MAP voltage KOEO?

Why shotgun all those parts but not a fuel _filter_?

Plugs and wires are how old?
Did you check them for carbon tracking?

Any trouble codes stored?

Does it have an EGR valve, is it stuck open?

Have you checked to see if the 5 volt sensor supply voltage isn't
shorted to ground?

Is the flywheel broken putting the camshaft position sensor out
of synch with the crankshaft position sensor?

 

bet the anti theft system kicked in somehow

 

Not if he can keep it running by pumping the gas pedal.