Sup guys I have a 02 4.8 RCSB. Over the past few months I've been getting random p0171 and p0174 both banks lean codes. It'll be on for a few days then go back off, my initial thoughts were vacuum leak. But I cant find one, I've changed MAF, intake and throttle body gaskets, and the evap vapor purge solenoid(I have the canister solenoid but I think that would be unrelated to the codes). Then I looked at possibly a fueling issue so I changed fuel filter, and the reg. Im getting 50psi key on/engine off and holding for 10+ minutes so I think the fuel pump is ok. The manual calls for 55-62 psi KOEO is the 5 psi low enough to throw codes? Any help is appreciated, thanks
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