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No, a power surge is not a very good explanation. When was the last time the burner was tuned up?
Also you need an oil burner tech to service the burner not a generic HVAC tech
Oil burner flames don't flicker unless there is a fuel problem. Was the burner motor slowing down when it flickered? If so then it could be an issue with the burner ignition control but it's not usually referred to a a board. Unlike gas fired furnaces most oil fired unit don't have a main control board. I'd need the model of you furnace to completely rule out a control board. That said a power surge can affect the electronics in either the ignition control or a control board. If the burner motor was running at normal speed then this is not likely an electrical issue.
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