So, here are the latest news:
The engine still does not start: the starter spins quite nicely, I have no spark and no pulse at the injectors (they do have ignition +, just no pulse).
Following advice from this forum and ideas from the shop manual, I have checked everything:
I have continuity on all the wires, all the grounds are good, TPS, IAC and MAP, coil and pick-up coil are good, the ignition module was checked today at the parts store; coil, cap, plugs and plug wires are new. I have gone through all the wiring (I think...), everything is where it is supposed to be. I have tried 2 different ECMs. The O2 sensor is not connected because there is no exhaust pipe yet. I have no trouble code because this combo has never run.
So what now??? What is happening, what do I have to look at? What am I forgetting?
Thanks!