I have got what appears to be a copy HKS SSQV, it seems to be leaking on idle as when you clamp the vacum pipe that leads to it the idle becomes more steady, does that mean its broken? If so is there any other valve that is easy to replace this one with? As this one is retained by a circlip into a housing that is welded into the FMIC pipe. What is a good valve to use to avoid issues with the AFM (unmetered air etc) does it need to recirculate?