I was driving my Malibu I 10 East 70 miles an hour and the speed dropped to 55 to zero. Check engine light cam on then engine shut off . Car never able to start again. Still broke down at this time.
Too bad this site is not licensed for gambling.
Since it has a timing chain but has tensioner issues, I won’t bet on that.
But with the lack of info, many, many possible reasons.
Sounds like it is time for a tow truck and a good independent mechanic. We can’t even give you a good guess at to the problem based the limited info in your post.