Im using the FMU that came with the sc kit and a comptech high flow fuel pump. Found out that I'm missing a IAT relay that connects to the pressure switch on the manifold, which would cause the lean issue, I think.

As for the ecu, if I were to use the Type R ecu that came with the motor, it idles fine however when I drive the car its not smooth, as if its missfiring or something. But, when I use the b16 ecu, it idles quite low at around 300 rpm, but when driven it feels alot smoother.?.