Considering the above photo the consider off likely straight down on all four ITBs is definitely the outlet with the tiny gap just with the throttleplate (on my ITBs there's no vacuum there - i.e. worthless) Are there any shops in your town which have a dyno and do tuning? https://4age20vforsale48147.wssblogs.com/34547407/a-simple-key-for-4age-20v-itb-unveiled