I finally figured out how to use the search feature here and answered my question before I asked it.
My 4.0 SOHC is doing the same thing most of the posts here described. Had this problem with a 4.0 OHV and all it took was a $10 part from Autozone. Hopefully that's all it is with this one, don't have any engine rattle, knock or any other strange noises.
And like many of the responses in this thread and other threads, it only started after a snap of cold weather hit.