Engine runs rough while stable track, engine light and traction control light comes on.

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G-161227

My stable track and traction control light and engine light all come on at the same time while the engine seems to run rough or skip. I had a scan done and it says cylinder 3 misfire. I replaced all of the spark plugs and the coil pack on cylinder 3 but it continues to do the same. It is a 2012 traverse. Any suggestions
 
Was the code P0303?
 
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