I just put a jdm b18b (98) in my 2000 Civic dx coupe!!! I'm running a 97 us ecu (p75) with my civic obd2b harness ( I converted the obd2b harness to the obd2a ecu my shelf by matching every thing) I have two issues, first my car idles at around 1500 and 1300 rpms ( seems high to me???) the second is that between 3500 and 4000 rpms my exhaust ratles if I press just a little hard on the gaz ( I have cold air, 4-2-1 polished header and a custom 2 1/4 cat back!

Need help guys!! PAT