97hatchb16

Alright bare with me guys, i have an obd1 b16a in my 97 hatch. Ever since ive swapped the motor the cel came on. First i extended the o2 sensor wires in the lower manifold so i can connect it to the harness. That only delayed the cel to come on when the temp. guage reaches the middle, as before it would light up as soon as i started the car. So i had my mechanic check it out with his ecu tester on both my p30 and the original obd2 ecu from the d16y7 to see the code. It said it was the iacv, car doesnt idle wierd at all but w/e i changed it and still the cel comes on when the car has warmed up. Dont know wut to do and my mechanic is out of service so i currently dont have anyone to take it to so now im looking for any suggestions. THanks