Considering the above image the just take off going straight down on all 4 ITBs is definitely the outlet in the tiny gap just via the throttleplate (on my ITBs there's no vacuum there - i.e. ineffective) I read online that when they aren't very well synced it may cause https://riverkssvu.develop-blog.com/41730735/4age-blacktop-engine-for-sale-secrets