I have a NL fairlane with an au motor in it. I have recently swapped the ecu over due to the car constantly revving, I now have a new ecu with a J3 chip in it. It also has a new ICV but when its connected it revs high, if I disconnect in it drives a little rough (stalls on occasion, the dizzy needs to be sorted) but doesnt rev.

I wonder if its due to the calibration of the J3 chip?

Open to any ideas.