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They are talking bollox about the exhaust flap. How coud that cause a missfire? I had the same thing and as mentioned it was a pre cat O2 sensor. It should store a code for this though. I would get the codes read while the light is on (without restarting etc) if possible.
ask them for the codes they read that pointed to a missfire, which cylider/cylinders where they in? If they say 1-3 you have left bank pre cat O2 sensor and if 4-6 you have right bank. If it is a single cylinder or 1&5 it points to something else like coils/plugs/injectors.
Is it lumpy on idle and cold start up, or is it fine untill the light comes on under load?
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