no power to purple starter wire

93 Z28 a/c, at, abs, power windows and locks, has oem resistor ignition key, jump purple wire car cranks starts up for 2 to 5 seconds. if carb clean down the intake will run fine, has injector pulse only for two seconds, then nothing. fuel pump pressure is at max 46-48psi. lowest fuel pressure is 40psi.

might be a VATS problem. try cleaning the contacts on the resistor pellet, and on the inside of the ignition

definately sounds like vats, the two orange wires on the ignition lock cylender often break, so that the vats system gets an infinite resistance which dosnt match the key, and it cuts power to the starter, ignition, and fuel.