what would caue the engine to run roof and sound likes it has a miss in it. less than 30,00 miles on it 3.5 engine size

What is your question?

I purchase a 2016 Cadillac V sport 2016 3.5 engine size and the engine runs roof and has a miss. the car only has 27,000 miles on it. I've take it back to the dealership and they cant seem to find anything wrong with it.

What makes this problem better or worse?

Nothing so far thought about having the spark plugs change

How long has your 2015 Cadillac CTS had this problem?

5 months ow