The microstutter that people have had trouble with since oblivion, and every game since is caused by the gamebryo game engine. I read several articles on google and after trying it I can confirm this is the case. The problem lies in that the game engine bases all graphics and physics at 64hz. Most monitor refresh rates are around 60hz. After setting my monitor refresh rate to 64 hz, the microstutter was gone! However I did this briefly as my monitor does not normally support 64hz, only 60hz. I don't recommend setting your refresh rate to 64hz as it could damage your monitor if it isn't supported.
It appears that this is something
Bethesda could fix, in a patch or hotfix for pc users. Since ifpsclamp only causes problems I won't recommend it. Here is a link that is more informative: http://forums.steampowered.com/forums/showthread.php?t=1525127
(By the way don't bother with the "fixes" on the page they don't work