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Vacuum leak, Idle air control valve, or dirty mass air flow sensor.

Check all vacuum lines for cracks or disconnection. Replace as needed

Turn on AC and check if the IAC valve cycle the engine to higher RPM to adjust for the AC load. IAC valve can be removed and cleaned..

Mass air flow sensor should be cleaned each time you change your air filter. Remove it from the Air inlet pipe and spray it out with MAF cleaner.

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Q: Why does you Subaru Legacy have a rough idle?
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