Replaced my plugs today with NGK IR, which was already in there. I replaced them because it felt like one was misfiring. It seemed like one was bad d/t the condition. It still seems like a misfire. No check engine light. Coil pack maybe?

 

Possibly. One way to tell is to get a good coil pack and swap it out one by one to see if you can identify the bad one if there is one. Also, scan for codes, sometimes they're there without triggering a light.

 

The last time my car misfired there was an engine light on.