My car (2008 Aero XWD, same engine as you X) had this problem before. I just did the coils a few months before, not that big of a job in reality. So, the car was doing the same behaviour as yours, hesitations at WOT (wide open throttle). So I bought another single coil, and began replacing the 1 of the 3 front coils one at the time. Always the same hesitation. While I was waiting for a code to appear and tell me which of the rear one was bad, Honey told me she was hearing a strange crushing noise from the right front wheel.
Bingo, here was my culprit. It was the transfer case output shaft bearing that was slowly destroying itself. Bearing was cheap, 35$, but the job is huge : remove the front pipe, drop the subframe, leave the steering rack attached to the chassis, remove a few engine mounts, remove the propshaft (be prepared to replace it too, as it will propably be bad after removal), remove the accessory belt, move the alternator a bit, and then remove the transfer case. BIG job for a seasoned DIYer like me.
But you may learn from my experience... With the transfer case on the bench, if the bearing is really toasted (no more balls), you can easily pull the hollow shaft with the bearing inner race still stuck to it. Then, with a puller, you can remove the outer race from the t-case quite easily. That's what I did. But then, after all this, I wonder if one can do it in situ, without removing the t-case from the car... Drill a hole in the end of the hollow shaft, and with an appropriate pulling device, remove the shaft from the t-case and then the outer race...
You'll need to find a way to press the new bearing on the shaft and then push the shaft/bearing in the t-case, but it looks doable. I will certainly try this method before doing another t-case removal in the future, if need be.
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