Still dying after it starts or still has a power loss?
Power loss might be related to the catalytic converter. Have you figured out how to pull codes on an OBDI ?
Dying after it starts could be any number of things, I wouldn't even know where to say start. Possibly emissions related, ignition, fuses/relays. I'd expect it's either fuel or ignition, or some of the emissions (sender, sensor, computer,ICM)
Maybe someone else has some better clues.
Keep looking and checking and chiming back with you find or don't find.
Like my aunt Rosanna Roseannadanna used to say, "That just goes to show, it's alllways somethin!"