What might be causing my Ford Mondeo to misfire intermittently?

My car is a Ford Mondeo 2.0-litre petrol Duratec, mileage 200,000. Problem is like a misfire but intermittent. Most noticeable under load. Any ideas?

Asked on 5 September 2010 by slimtim

Answered by Honest John
Might be the inlet manifold swirl flaps coming adrift. If one breaks off and gets ingested by the engine it's goodbye to the engine.
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