Bought a 97 1.6l lx with b16y7. It had idle surging problem and I traced it to the iac valve. Bought a replacement iac and installed it. Idle surge is gone but now check engine light is on. The light wasn’t on with old iac and the surging problem. I changed throttle body gasket and cleaned everything thoroughly. It also has 2 codes stored now with the cel. P1359 and p1509. Any ideas?