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Hi all. 2006 B9 Limited. 110k miles. Engine won't start one morning in May this year after a over filled gas tank. CEL spits out P0171 and P0174. Get her to the local Subaru shop with great reputation mid-July after putting her at side street for almost two months in FL weather. The canister turned out to be at "good" condition despite the over filled gas tank. Swapped out spark plug and engine started right away but engine was shaking. Gas was filled in tank and need some work to clear it out. Later changed out mass air sensor and engine can idle without shaking. But engine will shut off when shift to reverse. Please share your thoughts for path moving forward.

All ECU reads out "fine" according to shop technician. O2 sensor was checked and did not spit any error message. Historically, CEL spits out misfire P0301, P0303, and P0305 for 1, 3, and 5 regularly but went on and off by itself for last three years. Otherwise, she is running fine and smooth. Engine oil was leaking/burning a little bit but was checked and replaced regularly.
 

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The shop is awesome. After three weeks of hard work, the root cause is finally identified. Now she is back to the road.
 

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And what was such root cause, eventually?
 
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