Xterra Check Engine Light? It Might Be the Coils

My 2007 Xterra kept acting up once in a while, kept missfiring and shaking while driving. At times it would fix itself and finally it stopped doing it. I purchased a set of coils for the car and replaced all 6 coils. Once all were replaced, the car started to run smooth. After few weeks and almost 600 miles of driving, no check engine light came on and no code popped up. Links: Coil Pack: https://amzn.to/4m3bP61