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Are you getting a code for it? I think what you are describing is the IAC or Intake Air Control. It is kinda like a choke. It meters air that the motor gets at idle based on engine temp.
i got code 14... and according to this site... its EACV Electronic air control valve anyone know for sure?
it should be one the back of your intake manifold, but that depends on what motor you are talking about.