While driving on the highway, there was loss of power and I felt a vibration. Took it to the shop and it showed P0300 which is a cylinder misfire. They narrowed it down to cylinder 1. Unfortunately, this was in the back and it was a 3 hour labor. So I was like replace all 3 in the back along with the spark plugs, and now it is good.

Lesson learnt - when you replace spark plugs around 90k, replace the 3 coils at the back too and save the old coils too.