Dear experts, my civic has D15B dual vtec motor. its idle air control valve is having problem, upon troubleshooting found that the intake manifold is of some other engine. i am attaching pictures below of my intake manifold . on the back of Manifold P2J is mentioned. now i am totally confused should i install proper OEM manifold which comes for D15B dual vtec of should i keep this manifold and just replace the idle air control valve. please help for this. which IIRC code is mentioned on OEM Intake manifold of D15B Dual vtec engine??