Random misfire, codes P0300, P0301, P0302, andp0303?

Yesterday, I'm going down the interstate my car just started stuttering and stalling and it was like I wasn't even giving it any gas. The check engine light came on and started flashing. I have over 11 years' experience of being a mechanic, but nothing on this new model. It's got a misfire code on all cylinders except for four. So, I swapped the coils from three and four and three is still misfiring and fours not, so I don't think it's the coils. The past couple of months whenever I gas it to pass somebody or something it would kind of stutter for a second and it made a sound, and I was worried it could be the turbo gasket or maybe it was an exhaust gasket, but it's always pulled just fine. I put brand new iridium NGK spark plugs like it required yesterday and that didn't help at all.