[GTP Dad]

Welcome to AF!!

It sounds like you unhooked the proper plug on the transmission. I would check the oil pressure sending unit and replace it. You should find it above the oil filter. It looks like a small can and on most of these cars the fuel pump will shut off it the oil pressure drops too low as read by the computer.
If you change it you should get a good reading and the shutting off issue should stop. If that doesn't cure it you will need to change the crank position sensor. I may be going bad and causing the stalling problem.