If you want to check for your injectors firing, you will need a Noid/Test light available at any Pep Boys or Autozone.
What else has been done to your car? MAF? Inspect the wiring especially the orange wire coming from the positive feed on the battery cable. Also, try swapping the ECM with a good working unit. Disconnect the MAF and see if the car will start, if it does, then its your MAF.
Report back...and see my thread also, maybe that will point you in the right direction...
Steve Chambers