Question , is this a Flex-Fuel engine ?
Not according to the OP's first post.
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Question , is this a Flex-Fuel engine ?
Any codes associated with lean condition?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.