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A Mazda 626 may idle sporadically due to several reasons, including a dirty or failing idle air control valve (IAC), vacuum leaks, or issues with the fuel system such as a clogged fuel filter or failing fuel pump. Additionally, problems with the ignition system, such as worn spark plugs or ignition coils, can also lead to irregular idling. Regular maintenance and diagnostic checks are recommended to identify and resolve the underlying issue.

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6mo ago

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