I have a 1989 supra turbo, everything was idleing perfectly until I put an hks ssqv blow off valve kit on. Now it idles rough as hell, and my check engine light is on. Sometimes when i start it up the rpms start drop real low like it wants to die but once i give it gas it levels out. There is a putting noise to. The check engine light will periodically go awat but then returns when i push the car hard. I heard that there is no idle adjuster on the MKIIIs so what should i do? Everything runs smooth its just the crappy idle.