Flip/flop one of the coil packs around. Move it 1 position and see if the misfire follows.
Just remember your wire routing as stock coils are normally labeled but you will putting the "number" out of order if you know what I'm saying.
If the misfire moves from cylinder 6 to cylinder 5 or whatever, then you likely found the issue with the coil pack. Next step past that could be the ignition control module under the coil packs if the misfire stays on cylinder 6.
Or the worst case is that you lost compression on cylinder 6 from a piston ring problem, valve train issue.
