What does it mean if my 2006 Yamaha kodiak 450i accelerates good but not to its full potential and when you let go of the gas it dies down and putts and sometimes backfires and how do i fix it?

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What does it mean if my 2006 Yamaha kodiak 450i accelerates good but not to its full potential and when you let go of the gas it dies down and putts and sometimes backfires and how do i fix it?