So I am having a very odd error with skyrim's sprint, it seems to be moving twice as fast (though that may just be me) but now in first person ONLY it will stop and start. So I will initiate the sprint, move as if I'm using whirlwind, then stop for a good half a second, then do the same, ect. In third person, this does not happen. My FPS has also seemed to have almost doubled, and I have no clue what's going on with that either (I've changed nothing with the PC whatsoever).

Anyone else getting anything similar to this?

You can see how fast you are going in the console. Type:

player.getav speedmult

The default # is 100

It's 100.00, but yet my issue persists. It's odd, it only happens in first person.

EDIT: WOW. Just figured it out. Loading showed me as standing, third person showed me as standing. Turns out, I had quicksaved while crouching, so it thought I was crouching when saved, it just didn't change the position of my character or the reticle. Which meant that when I sprinted, it did the somersault action, but here's the weirder part: I haven't unlocked that yet.

Oh well, I'm glad to figure this out, means I can start playing again.

This bug still works.
While you are in sneak mode, hold the sprint and forward buttons, then begin to spam the button of weapon ready. Its works when magic in the hands. And its works even at 3d person mode.