hi---replaced iac it now runs worse the idle goes past 2000 then settles down i just tried it in the shop not on the road pvc valve looks and rattles like new . untill the problem is figured out i left the iac unhooked ( it still runs unhooked on new and old )and adjusted the idle screw on throttle body it seems to idle more like it should that way any more ideas ? also checked for vacuum leaks john