Suck my DX

the cel 14 has been on for a few days now...so i swapped the one from my old d15b7...but the car still has the light even after i reset the ecu....what it does now since the cel came on is it will not start unless i apply some gas..and i gotta keep givin it a little gas until it finally warms up..if i take my foot of the gas at all while its still warming up the revs drop to like 4-5 hundred and it just dies..but after it warms up it runs fine..so im not sure if its the actual iacv thats the problem..because the one from the old motor was still good..what else do you guys think it could be...maybe a loose wire or vaccum leak