Why does the Mazda 6 keep idling up and down?

The Mazda 6 may experience fluctuating idle due to several potential issues, such as a vacuum leak, a malfunctioning idle air control valve, or a dirty throttle body. Additionally, problems with the mass airflow sensor or fuel delivery system can also contribute to unstable idling. It's advisable to diagnose the vehicle using an OBD-II scanner to identify any error codes and address the underlying cause. Regular maintenance can help prevent such issues from occurring.