A 2005 Mazda 3 may idle roughly at low RPMs due to several potential issues, such as a dirty or faulty idle air control valve, which regulates airflow during idling. Other possibilities include vacuum leaks, which can disrupt the air-fuel mixture, or issues with spark plugs or ignition coils that affect engine performance. Additionally, problems with the fuel system, like a clogged fuel filter or failing fuel pump, could also contribute to rough idling. A diagnostic check can help pinpoint the exact cause.
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