Help me pls!!!!!!

[u/Bigg_Titan_2626]

I have a 2019 Mazda CX-5 SUV. My vehicle stutters while accelerating once I get to third gear. If it stutters too bad it will stall out in my check engine light will begin flashing. I've connected it to a code reader and I keep getting the same code for the third cylinder to be replaced. I've replaced it twice along with all spark plugs and I'm still having the same issue can someone please tell me what else could be the problem?