I figured it out totally last night. For some reason the #4 injector driver took a crap on the AEM.
Fortunately the AEM has 10 injector outputs (so I have 4 spares) I took an old wiring harness, and yanked the pin and some extra wire out of it. I then put it into my RB26 harness, in the spot for the #7 injector output on the AEM.
I then went into the injector configuration, turned injector 4 off, turned injector 7 on, and then corrected the injector phasing on inj 7 to match what #4 was....
Fired like a champ