92 manaul, throwing code 54

[Duce40KAT]

i have a 92 s13, auto to manual. it use to have an auto harness in it, but i have a manual now. there was a white plug behind my dash that the original harness had, but the manual didnt. so i couldnt plug it up. got everything else good though. i did have a maf problem. fixed it i think. new tps. coolant temp. sensor is good.

and now it is throwing a code 54 from the ecu. dohc btw. and running rich as hell.

have no idea whats wrong.