Checking out the above mentioned photo the choose off going straight down on all 4 ITBs could be the outlet with the little gap just through the throttleplate (on my ITBs there is no vacuum there - i.e. ineffective) This will make certain that the throttle plate is completely closed, https://toyota4age93693.bloggazzo.com/33651372/the-fact-about-jdm-toyota-4a-ge-that-no-one-is-suggesting