To make it short I have a 91 teg and need to know what code’s 12 and 43 are? Car was running real high rpms, I replaced a few parts, and the idle came down lots. It was idling around 2.5k to 3k. Now its at 1.5k and the light comes on after about 10-15 sec. Before it would come on after 10-15min. of driving. I replaced the IAVC, map sensors, and most hoses. The check engine light came on before I even changed any thing out but like a dumb ass I didn’t flash the ecu before hand. So does any one know what those codes are?