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There is also an option to remove and clean the injector. It's worth it if it has failed due to being clogged up. Also, I would recommend replacing the fuel filter if you go down the path of fitting a new injector.
When was the fuel filter replaced?
A dirty/faulty injector can cause the problems you described and the fact that the diagnostic computer has also picked that up so, you can't really argue with what the ECU tells you. You should replace the fuel filter first because it has to be replaced every 30,000miles and if you use supermarket fuel, I would recommend changing it before the standard 30,000mile rule.