I did a complete swap (98 D16y8 engine, transmission(manual), harness and ecu on my 1997 civic dx(manual tranny). After putting everything together, I fire it up and its looking for the IAC, which the engine I swap doesn't have IAC. So I swap a throttle body from a 99 D16y8 engine(Automatic) that has IAC. When I fire it up the IAC code was gone but now it idles rough, no power and backfires.
What I have done wrong and how can I fix it?
Thanks