What did you do to your FX / QX70 today?

Got home two hours early today and had time to quick detail, then do up a layer of paste wax and back to black on exterior trim. Lookin clean two days before I lose her for a month.
 
engine light came on so plugged in the consult and Code P034 apeared.. something about Cylinder 4 missfiring..

does anyone know how bad this problem is?
 
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