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change question then car has slight missfire on start up but clears once reved
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I suspect what you are getting with the gearbox is the engine ecu is keeping the gearbox in a lower gear to help the engine warm up faster and reduce emissions.
As there are no fault codes being stored, then I don't think you have anything to worry about.
The slight misfire could be due to worn spark plugs so I would replace these first.