P0301 code 05 Chavy Tahoe LT

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rejects

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I recently ran a check on my vehicle and came up with the # 1 cylinder misfiring. I went ahead and changed the plugs with A/C Delco Iridium and changed the wires as well. Noticed the Tahoe was initially running smoothly but now I got the code again. I am new to this so any help would be appreciated...
 

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