Check engine light went off, car a bit sluggish and diagnostic test codes below. on 2009 Chevrolet Malibu

The light went off (1,500 miles ago) after getting gas so I figured I needed a cap and they ran a test and said it wasn't my cap. The codes that came up were U2105, U2106, U2107, P0449 and P0455.....113,000 miles on car, mostly highway miles.

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