Car shaking, loss of power

About a week ago I started hearing this sound coming from the engine bay. Sounds like if you were to tap your pen on a wooden table. Today, I was dropping a friend off and the car started to shake badly and the engine light came on. The tapping noise seems to get more pronounced when I turned the AC on.



I know I need to get the codes read. I'm working on it. What do you guys think?



I'm thinking spark plug or coil culprit?



Forgot to mention, loss of power, feels sluggish