Pull 1,7 and 5 plugs to check for coolant I don't know though what are the chances it is leaking in all those cylinders especially 5?

 

Start with pulling the misfiring plugs, are they wet, black or sooty, do they smell like coolant? Have the 02's been changed yet?

 

yes the 02 have been changed since ive owned it, they were done back in january.
and no codes were coming up after 02's until i needed head gaskets...
about the 02 codes, i cant do anything about them until i get a new(er) exhaust because i do have a nice crack in the cat.