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Yukon lean Bank 1 problem

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2002 GMC yukon 5.3

130K miles

Rough idle at times and check engine light also comes on and blinks at times. Doesn't always blink and will actually turn off and run fine for weeks at times. Seafoam seams to clear it up for awhile but doesn't work for as long now. Had the codes checked and came up with:




My thought is maybe a intake gasket leak. Have tried spraying carb cleaner around driverside intake and haven't noticed any change. Wondering if I should change out the 02 sensor or if the lean bank 1 would throw that code. Not sure where to start.

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