code 1518 on the scan tool
 

just for the heck of it i hooked a scan tool to my stang and no crap there was a code so i cleared it and it came right back.......aaagh!!! so i went back to the books it was the IMRC (intake manifold runner control) bank one stuck open???? has any one had this problem or know what im looking for? i know that this is a set of flaper valves in the intake that are closed below 3000 RPMS and open to get more air flow above that .i also know that they are vacume controled but i do not know where the vacume acuator is? or how to fix the problem? help!!!!!