05 cts bad misfire HELP!!!

I have a 05 cts 3.6l and it has a bad misfire in cylinder 6 it started only when accelerating you could feel it missing so i decided to change the plugs .....and get the fuel system flushed.....so after i put the new plugs on i figured i would be good to go...but ever since than its been worse it does it at idle and under accelration.....i have a scanner and its still only on cylinder 6 i tried swapping the coil to make sure it wasnt a bad coil and it still does it .....im not sure what else to check or if anyone else has had this problem any help would be appreciated thank you

After swapping cop 6, did you retset & clear code?

I would roll injector #6 next!

yes...after i swapped coils i reset and cleared all codes and hooked the scanner back up i misfired as soon as i reved the engine past 1500rpm

check your oil, low oil causes misfires due to the variablevalve time

Did you fix the problem?