2000 GMC Savana 1500 5.0 NO START CONDITION

Hi guys, haven't been on here for a while, but I am STUMPED!! I have fuel to the rail (leak down test passed) good blue spark at all 8 plugs....replaced: plugs(iridium), wires, distributor cap, rotor, throttle position sensor, fuel filter. 130k miles....cranks easy, won't fire up, does with a shot of ether then dies. I've been over it with 2 mechanics...no codes, no lights...at speed sensor needs replaced (doing it today).... Could it be the Passlock???? Would a worn ignition be my ghost???
PLEASE HELP, I'm RUNNING OUT OF VACATION TIME!!!!!

Have you checked the actual injectors?