ECM or Injector Problem? Help!

[ShadMan]

Well, I was having problems with my '96 Tahoe LT 5.7L 4x4 missing in cylinders 1, 2, 3, and 4. Scanning showed that all 4 injectors were wide open at 5.3 . I replaced all four inectors with new. Now 3 and 4 are firing normally, but 1 and 2 are still wide open flowing at 5.3 . Two bad injectors, or a bad ECM? If the ECM, can it simply be reprogrammed or do I need to replace it? If I just need to reprogram it, anyone know how much a dealer would charge, or does anyone here work for a dealer that can do it in their free time? Thanks!

[Speed Scene Wiring]

We recalibrae the Vortec computer, there are so many software patches issued by GM for this computer, its crazy. The best way to test a internal vortec injector is to use a Tech II and shut down each injector. Once shut down, you will fell the engine run rough. Also, make sure you are not just feeling a misfire due to old ignition parts, Plugs, wires, cap and rotor. What kind of scan tool are you using. That sound like a millisecond reading.

[mudslinger99]

Originally Posted by Speed Scene Wiring

We recalibrae the Vortec computer, there are so many software patches issued by GM for this computer, its crazy. The best way to test a internal vortec injector is to use a Tech II and shut down each injector. Once shut down, you will fell the engine run rough. Also, make sure you are not just feeling a misfire due to old ignition parts, Plugs, wires, cap and rotor. What kind of scan tool are you using. That sound like a millisecond reading.

Damn that dark red is hard to see