What is/are the actual code(s)? There's more than one lean code so it would help determine what to check.
Simple things to check/try is:
1. Look for leaks in the intake and exhaust from the MAF sensors all the way to the
primary O2 sensors.
2. Clean the MAF sensors.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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