Mike beck Posted December 23, 2018 Share Posted December 23, 2018 I have a focus mk3 St. Recently at idle I am getting misfires one every 5 seconds. I have no vacuum leaks spark plugs are ok. It stops misfiring when i get below 1/4 of a tank of fuel. Soon as I fill it back up misfires reappear. Anyone have any ideas. Quote Link to comment Share on other sites More sharing options...
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