Your AF Correction is max'ed at +25, which is the limit. The engine is so lean(>25%) that the ECU can no longer compensate, so your AFR is higher than the 14.7:1 it should be. Gotta be a significant leak after the MAF, and since/if it is at idle only then Phil may be right.
To make sure it is at idle only - you may want to log and graph the AF corrections while cruising around.
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