Newbie needs help, misfires.
 

Hi all I'm new to this site as well as a new c class owner, I have a 03 c240, love the car but randomly the other day it died on me while on the freeway, I was thinking I ran out of gas (my fuel gauge has been acting up) so I got gas and it started up and drove another 10 minutes before stalling again and eventually not starting, towed it home and ran a diagnostic, I had about 3-4 misfire codes from various cylinders, so I moved around the coil packs and wires and got no change, changed all 12 plugs and it helped a little but now I'm getting a consistant cylinder 6 misfire and when I get the car running I'll unplug that coil and there will be no change, the coil is getting power, checked fuel pressure and it's at about 55psi, I'm kind of stuck not sure what to check next. Thank you all!