NHTSA Complaint #11548879 — 2014 KIA CADENZA

I was driving my car at about 70 miles per hour then all of a sudden it went from 70 to like 40 and wouldn't pick up speed the engine light did come on I did get it to a mechanic to have my coils and spark plugs change but car was still knocking mechanic said it was the engine even before this it was always a knocking noise at start up even after oil changes everytime I call about this engine issue it's always cadenza not included but I see that most of the complaints is about the engine the same issues like the others my car is paid for but can't drive it if this problem was known we should be included for a new engine people like myself only work 32hrs cause my job like others are not doing good don't have the 5 to $10,000 kia dealership quoted me at to fix this car that was already known to be bad this is sad but im going to keep pushing until I get to the bottom including a lawsuit because this is not fair at all.