I really have to concur with the Other folks, the ITB's should operate like a scalded ape. Specially down lower or in all places in between. If they are not, then I might also Verify gas force, and ensure the throttle linkage is opening all four equally and evenly (synchronized). https://4age-20v-itbs48147.designertoblog.com/63863834/5-simple-techniques-for-toyota-4a-ge