okay, i just got a JDM swap from a friend. vtec wiring harness, P28 ecu all from a Z6. im missing the Purge Silinoid. would that cause a check engine light and or an irractic idle at start up? it only does it when warming up. its an idle surge up and down, then will go away. the surging comes back when the car is in neutral at a stop. the car runs fine, Vtec is wired up, but im still getting the surging and a check engine light.

any suggestions?