Where did you pull a worn piston ring from that ?
1) Get the codes pulled. Go to Autozone if you have one near. They do it for free.
2) Write down the code, post back here.
3) Then, folks can help you out.
FWIW, the vibration & misfiring sounds like a bad plug or plug wire. If there is no smoke from the car, then it is unlikely you are burning oil.
Cheers .......
