If that check engine light is flashing while you are driving, then you are actively misfiring. I would take it easy until you figure it out. I had a car that did something like that once and it was a cracked spark plug. When I see that U042B code though, makes me thinks it is something ground or wiring related which could lead to misfires too.
-Geoff
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'12 2SS RS Convertible - Traded in.
'16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold!
'23 2SS Convertible -Same as above except orange.
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