Q: Pulled codes, says engine running lean.

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Check engine light has been on for almost 5 months, I've had the codes pulled before found out what the codes were. I re pulled the codes at school, we are lucky to have a scanner along with some other tools, any way got engine running lean for both cylinder banks. My question is what should I check so I can fix the issue?

My car has 145000 miles.
My car has a manual transmission.

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