I just bought a jdm b18b obd1 with auto tranny and I am putting it in a 1995 civic ex coupe. In previous jdm swaps I have had to modify the wireing harness from the car to match usdm harness to jdm harness. Basically im just wondering do I need to modify the harness on the swap that I am doing, some people say its plug and play but IDK. When I connected the plugs together I still have a plug that has no where to go, so qhats up with that??? Oh I do have everything hooked up and it turns over but will not run.