[Rick V]

Do your best to find where the o-rings went, make sure they are nor running around in the valve train somewhere. That wouldn't be a good thing. Ok Yes you have to have the o-rings there. Yes they are installed from the factory, if yours are missing they were omitted for what reason, who knows. Ok oil issue done with. Find a scanner, find out what cylinder is missing, pull that coil and plug and look for the obvious. (cracked or closed up plug, cracked coil, not hooked up coil) If everything looks good to the visual inspection, change the coil out with one from a diff. cylinder. If your miss jumps to that hole you have a bad coil, if the miss stays put you have a bad plug, if the miss goes away you did something wrong when you replaced the plugs the first time.
Now, go get-um. Don't freak out and flatbed the car to the shop, you can fix this yourself.
Advice from a Porsche mechanic (me) just relax, think your way through the issue, and break this down to one step at a time.