Didn't you happen to notice the timing being pulled? Two cylinders are off what the others are doing. Maybe, maybe not the issue. Certainly isn't good. Injectors? Plugs or coils? Or am I seeing something wrong? And to check the transfer case oil like F22 suggests really isn't a big deal too. But always with modding, you start there. Back out of what was changed before the problem appeared. Of course the problem might be unrelated too.
Good luck!
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