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Old 22-02-2022, 07:57 PM   #3
cobrin
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Join Date: Jan 2006
Location: Under the Southern Cross
Posts: 882
Default Re: Mondeo revs up and down when coasting

Behaviour like that reminds me of a vacuum leak, best time to use a smoke machine lol. You could dot spray brakekleen around the intake system and see if the rpm changes, or use an obd scanner and look at intake map readings or exhaust O2 readings.


Or take it to a workshop to diagnose.
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