My 08 mcs 6speed intermittently throws a po304 but I dont have any driveability issues. I installed new spark plugs and checked resistance on the coils and they all read the same. I put about 700 miles on it with no problems but today just after starting it up it threw the code again and it still drives great! Ideas... sorry if this has been covered. I tried scouring as many posts as I could but all I could find had driveability issues.