I'm using the 360revolution mod for mw3 and I extract my save to desktop and then open it thru the MW3 gamesave and use max health, unlimited sprint, and increased the player speed/sprint speed/jump height and when I save it it says "Error Saving File". http://www.4shared.com/file/C6tlXzKh/savegame.html?
its possible that you have chnaged too much in the gamesave?? I modded my MW3 save to walk through the single player mode and i would run and the game would stall, i changed it back to the orginaly setting and it worked fine. Other guys on the site will give you a more indepth reason?
No I don't think I changed too much, because I only enabled unlimited health to try it and still didn't work. But thanks for the input.