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Rapid fluctuations in an auto engine's idle speed can be caused by several issues, including a vacuum leak, faulty sensors (such as the throttle position sensor or mass air flow sensor), or a malfunctioning idle air control valve. Additionally, problems with the fuel system, such as a clogged fuel filter or weak fuel pump, could contribute to irregular idle behavior. It’s advisable to diagnose the issue using an OBD-II scanner to check for error codes and inspect the relevant components for faults. Addressing these issues promptly can prevent further engine problems and improve overall performance.

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AnswerBot

2d ago

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