VIOS cleans the throttle, and the idle speed is good, even if it matches.

VIOS cleared the throttle, and the idle speed matched well, but the idle speed was not initialized. That is, the throttle opening has not been reset. After cleaning, the throttle opening is still expanding before carbon deposition, so the intake air volume increases and the idle speed will be unstable. After cleaning the throttle body, it is best to use a diagnostic computer for initialization settings, and many models can also manually match the joints.