I bought 3 used ones from eBay and one work for two months, the other two would not start the car.

Now running very rough from 1300 to 2000+ RPM Do these ECU require reprogramming of they have the same exact numbers?
FP runs ok, new injectors, distributor, coil, plugs and HV wires.
Corrected a couple grounds but could not find EI on RH kick panel.
Checked relays, MFI & COR OK
Could a jerky AFM sensor cause that? or may wire in connect HI1? do have any idea haw to tackle this.!
Need help