Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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This is a lean code and I see you have tried most things that cause it.
Check and make sure there isn't a crack in the exhaust manifold. This can cause the lean code because it's sucking air before the front O2 sensor.
If there isn't any exhaust leaks either a crack or a gasket issue there, then it could be as simple as the front O2 sensor reading wrong. This will cause the computer to make a lean fuel mixture and then you will get the code.
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I hadn't heard from you so I thought I would check and see if you need further assistance with this?