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A lean condition could be caused by a vacuum leak. Have you had someone do a smoke test yet? Vibration that doesn't go away in P or N and a lean code would indicate that un-metered air is entering the combustion chamber. The reason your car smooths out when you're not at idle is because its taking in more air and the small amount of un-metered air isn't as significant.
Anyways, I have the same issues are you, minus the codes, but including the poor fuel mileage. I had a smoke test done and I'm leaking from the CCV tube under the intake manifold. The mechanic also noted that my passenger engine mount was leaking.
I'm going to do the work this weekend and I'll let you know if it fixes the problem.
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