2012 no.2 mis fire

I started noticing a light tapping on the passenger
side head. I noticed it was a lil low on oil so i filled
to correct level but it was still there.right before
inspection i happened to punch it and engine light
came on took it to oreileys they said no. 2 misfire i
put new plugs and coil reset battery and i thuoght
broblem was solved. A mon or so later i punch it
again and it bogs out takes a min but it goes back
to normal. Yesyerday am goin over tall bridge
doing about 80 and it starts losing strength engine
light comes on and stays on take it to oreils it still
same cilynder no.2. I open it up to hope its pnly a
broken spring and i find the rocker scoured.is this
my problem?