Lean both banks w/ no apparent air leaks

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Foggy

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I'm thinking a weak fuel pump or pump driver module
or, throttle body issue - just my 2 cents
 

S33k3r

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This is interesting. I have a 2004 Silverado LD; it's running the 6.0, but I'm experiencing the same problem as OP. I haven't performed near the diagnostic or parts cannon work he discusses, but I'm saving my $$$ to take it to a tuner for a more in depth analysis. I haven't hit anyone up for help on mine, yet, as I don't have the time or money to sink into it. But I am close! Frustrating as all get out -- terrible power, and I am getting 10 MPG.
 

wsteele

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This is interesting. I have a 2004 Silverado LD; it's running the 6.0, but I'm experiencing the same problem as OP. I haven't performed near the diagnostic or parts cannon work he discusses, but I'm saving my $$$ to take it to a tuner for a more in depth analysis. I haven't hit anyone up for help on mine, yet, as I don't have the time or money to sink into it. But I am close! Frustrating as all get out -- terrible power, and I am getting 10 MPG.
Any codes associated with lean condition?

BTW, the OP never came back. Hope he is OK.
 

Douglas Friedberg

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Wasn’t there something about Pcv valve cover issues with these engines. ??? Bad pcv system will effect all cylinders.
 

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