2000 maxima se hesitating and back firing

The Nissan dealership has changed the spark plugs, all the coils, and the fuel injectors and still there is a misfire in the 6th cylinder. they have flushed and reflushed and still after a few days it starts running rough again. Has anyone else experienced this? Nissan don't seem to know what to do next. Last time they had it for 2 1/2 weeks!

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DAG
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Jim Mcnamara

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