XFI.....no injector pulse

Car was idling fine, would go up on the 2 step and build boost. Then all of a sudden, step on the gas and just as it starts to build rpm, it started to spit and sputter and would die out if I didn't let off the gas. It would crank fine and idle, but gasing it was a no go. After messing with it trying to find the problem, I noticed in the XFI that the injector leds were falling out. Tried a different injector harness with same result. That was about 3 months ago and the car has just been sitting.....now, present day, car just spins over . Cam and crank signal leds on the box seem fine, but no injector at all now. Don't know where to start.....XFI ? Ignition module ? Wiring ? Anyone had similar problem before I start replacing parts ??