Need help

[Luis mora]

Yesterday my check engine light came on and I have 2 codes P0171 and P0174 lean system I clean the air mass flow sensor, light came back on in less then 2 miles truck runs fine no idle issues 07 tahoe with 106k...

 

[79jasper]

Could be intake gaskets.

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[Foggy]

You have un metered air getting in past the MAF somewhere.. Vacuum leak
somewhere..

 

[PG01]

Me too