Strange and questionable, unsure and

eg sedan and harness...f22b2 eng trans and, well 2 different ecus..
f22 accord ecu pT3 plugged in and motor has erratic idle like bad iacv (rev...rev...rev) but plug in old d15 p06 ecu and no erratic idle, low idle and lack of power for obvious reasons

question is, what the hell??!! why would the idle be different between the 2 ecus? i know other things can cause the erratic idle but i dont know what they are lol any input??

 

I have done this swap, but in an ej chassis. you will have to track down wiring info on both ecu pinouts. I ran obd2 setup though so its a bit different but I was able to plug in my pob ecu and it ran my obd2 f22b2 motor flawlessly. use the ecu that was made for the obd1 f22B2 and as long as you grafted your existing wire harness right you should have no problem.