My cat was replaced and my car is still chugging why? on 2003 Nissan Sentra

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plugs replaced coils......please help
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code was cat needed to be replaced....but got in car drove away from repair shop and still didn't sound right. More I drove back to the chugging sound like it was missing a cylinder as before......and yes light came back on not right away but within 2 days.....please help
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