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The engine stuttering and backfiring in a 2003 Subaru Legacy Outback during acceleration could be caused by several issues, including a malfunctioning fuel system, such as a clogged fuel filter or failing fuel pump. Additionally, ignition problems, such as worn spark plugs, faulty ignition coils, or issues with the timing, can lead to incomplete combustion, resulting in backfiring. Air intake issues, like a dirty mass airflow sensor or vacuum leaks, can also disrupt the air-fuel mixture, causing these symptoms. A thorough diagnostic check is recommended to pinpoint the exact cause.

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3w ago

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