in the controls menu it's says L-Shift to run ..

[royki]

I press L-shift and he walk slowly instead why is that ?

[Lucas McCain]

I have never been able to figure that out. There is no sprint in FO3, just run and walk. However, if you want to walk by default and run with shift, I think "caps lock" will toggle that setup. Hope this helps.

[Subatomic]

Alternatively, you can get a mod that adds real sprinting: http://www.nexusmods.com/fallout3/mods/1854/

There's also another mod that adds sprinting and the ability to bind grenades to a hotkey (like in most FPS games). Link to that: http://www.nexusmods.com/fallout3/mods/17359/

[Lucas McCain]

Good catch, I forgot about that one. I didn't end up using it, but I remember seeing it now.

[BenWah]

Fallout wanderer's edition includes both of those features also

[Subatomic]

FWE is a bit over-the-top if you just want to sprint properly.

[royki]

ah well i think i want to beat the game as it is b4 using mods, thanks anyway :)