So my truck has been running leans in both banks for about a month now and I'm out of ideas. Today I replaced my pcv valve and hose along with cleaning every sensor I could get my hands on. Iv also checked every hose for cracks but nothing. Iv replaced plugs, seafoamed it, cleaned the injectors. I dont know what else to do! Goin nuts here

 

Fuel pump pressure
Leak at the intake manifold gasket
TPS out of spec

 

as OTR said, id also suspect a bad MAF, maybe someone local has one that you could trade? did you do the MAF mod by chance?

 

or maybe your 02 sensors are bad?

 

Nope already tried that MAF and its good.

As far as gaskets go I'm not sure how to check those so havnt tried to see if that was the problem. I did spray carb cleaner while the engine was running to see if it was sucking in air anywhere else but didnt notice anything.

 

its most likely the fuel pump man. you may be getting enough pressure from it but not enough volume. its rare that the intake gasket would leak on both banks but it is a possibility. also have you tried replacing your fuel filter?

 

Remove and reinstall the intake tube between the MAF and the throttle body , make sure it is tight and doesn't leak.
Next , remove a battery cable for half an hour then reconnect.Start the truck and let it relearn its idle.
Drive it normally for a day so the PCM can relearn its optimum settings.

 

Wow, if you would have listened to me the first time and used the fuel-trims to get data on your problem this would have been fixed by now.

 

put more gas in it.

 

change wires?

 

Do you have a procedure for doing that?

 

i bet fuel pressure regulator,, check the pressure on the fuel rail fitting,,and change the fuel filter,

 

to check you gaskets go get a can of startin fluid from any parts house crank your truck and start sprayin, if the engine revs you have a leak