My Honda B20B swap is running lean?

I recently swapped a B20B onto my honda civic 97, everything is pretty good only thing is i'm getting a Check engine code because the car is running lean, any advice on what i can do to fix it.

Cool

Why did you swap in a b20b those make like 140 hp but the code could be caused by bad spark plug, oxygen sensor, vacuum leak, exhaust leak and many other things I'd start with spark plugs because obviously they are easy and cheap to replace

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