Normally that's a result of a failed spark plug seal. If you have no other problems I would put new spark plugs in it and check them at the next oil change.
Vehicle:
Subaru Impreza
Reviews of OEM Subaru spark plug
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Since then I have take good care of it, replaced the brakes on schedule in August 2020 and then in August 2021 new spark plugs.
Pros: replaced brakes, new spark plugs
Vehicle:
Subaru Forester
We just got the 60k service done (spark plugs) and it still does it.
Cons: shaking still present
Vehicle:
Subaru Outback
Mileage: 96560 km
My 2002 had a similar issue. In my case it was the spark plugs, $250 fix.
Pros: easy fix
Vehicle:
Subaru Outback
a spark plug job on an STI can be a 6+ hour job :thumbdown:
Cons: spark plug job difficult
Vehicle:
Subaru
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