I know that, but I've tried another fuel ecu before, and that also didn't make a difference, so 2 defective ecu's don't seem logical, so maybe a crucial input is missing.
The ecu has the output voltages, and I know it gets power supply, so it's the ecu, or one of the sensor, and as I recall, that air flow sensor on the side of your metering unit measures how much air is flowing.
Based on that, it enriches, so I think it somewhere in that process where it goes wrong.

And correct me if I'm wrong about what the ecu uses to enrich(when hot)....