Kevinlfc17 Posted November 2, 2012 Share Posted November 2, 2012 Hi I have a 2003 mondeo 2.5v6 now and again the revs go up and down on idle there is no misfire or lack of power what could that be Quote Link to comment Share on other sites More sharing options...
mintalkin Posted November 2, 2012 Share Posted November 2, 2012 it could be a blocked PCV valve or an air leak on any of the pcv plastic lines. Quote Link to comment Share on other sites More sharing options...
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