Yet again my b18c swap has run into trouble. (b18c block, p72 head, oem type r style TB/MI, AEM CAI, oem exhaust manifold, P73 ECU)
Last time it was leaning out horribly STFT (maxing out at +45.9%. Now at idle the STFT will range between -16% to -24%.
Now the ECU is having to remove fuel...