are you using the ecu for the engine w/ the 2 wire iacv or your old ecu for the 3 wire iacv. it's not as simple as connecting the same color wires. one of the 3 wires isn't used (obviously) and then one of the wires needs to be moved in the ecu harness. it depends on which obd2 you have. a or b? if you use the 3 wire ecu you need to use the 3 wire iacv and 2 wire ecu with the 2 wire iacv.

what is the exact engine/chassis/ecu combo now?