did you swap out the fuel line that runs from the fuel filter to the fuel rail? You need to be running the B18 line. You can get it from Sohfast for about $40 shipped.
also, you may need to upgrade your fuel pump as the D15 doesn't push as much as the B18.
finally, I'm not quite understanding what you mean by the computer plug... do you mean how do you check your CEL?
That would be to the right of your glove box, near your ecu.
There's a how-to out on
www.jdmfan.com and
www.c-speedracing.com
hih.