check engine light or cel

Hey forum!!! The cel is a code 43. I have a 91 Teg with a b20 swap it has a header pipe with a blox tbi and a skunk 2 intake mani With a cold air intake. First of all the car is running rich and I just put a ngk o2 the cel doesn’t stay on the whole I can turn off the car and the light turns off then it may come back on with in the mile or it may take two days. Has anyone had this problem? Help!!!:hyper:

what you having is called and intermittent problem, it comes and goes but good news for you is you already know the code. now search around and try to figgure out your actuall problem !