i made a b20 obd1 on a 92 ls ecu,. and im throwing a cel 12. and 43

so exhaust gas recirculation lift valve, and the fuel supply code..

wat can i do to fix it ... the lines and everything are all working fine. i only got this on this motor . the b16 i had in it before had no cel's. motor runs good. but the idle is on the floor.

any help is appreciated

 

ive had 43's before but not 12's is it anything serious?