I should agree With all the others, the ITB's should run like a scalded ape. In particular down low or in all places in between. If they are not, then I might also Verify gas tension, and make sure the throttle linkage is opening all 4 equally and evenly (synchronized). https://4ageengineforsale49269.jaiblogs.com/59533589/getting-my-toyota-4age-for-sale-to-work