get a long screw driver and use it like a stethoscope on the body of injector and other end to your ear
try hear if injecotr is clicking
then work yr way back
if inj is clicking then u have fuel problem but u say its got pressure
its prob a problem in ignition system like glover said which in turn is making the ecu
shut down the injectors as a safety precaution built into most toyota ecus