Yes I am well aware the the Z3 motor came with the RBC intake and I have already put the RSX TB on the car via Karcepts adapter and I am using the wiring harness off an 03 manual Type S. I have it all installed in the car already, hence the idle issue. There is no way to use the factory ECU and try to run the DBW system in the older cars unless you rewire and customize everything. I have seen the dual piggyback ECU setup and am not too impressed.
Just a couple pics of the car, I have a ton more on myspace.com/staleydj
As for the fuel system, I have the Walboro 255 and AEM fpr and I have it set to 52psi so I dont think that is a problem. I will run the duty cycle on the IAC to check for changes and see if that does anything. Thanks for the interest.