I must concur Using the Many others, the ITB's must operate like a scalded ape. Primarily down low or almost everywhere in between. If they're not, then I would also Look at gasoline stress, and ensure the throttle linkage is opening all 4 equally and evenly (synchronized). I'm not sure https://toyota4ageengineforsale94692.wssblogs.com/32509377/the-5-second-trick-for-toyota-4age-blacktop-engine-for-sale