Why do my models have black fuzzy bits on them? I've been working on a hmmwv and it was going fine until this glitch randomly appeared on every object in the scene. 

The 'Texture' of object mode/edit mode has black fuzzy bits in it and some of the mesh you can see through some of the mesh you can't but their is clearly a face their as when I go into face select mode I can highlight the ones I can see through. I've also tried to fix it by highlighting it and removing doubles but that doesn't seem to do anything. 

I have a screenshot of what I mean:
It looks like "z-fighting" -- when you have multiple polys that are overlapping (normals facing the same direction) and very close to each other... and then your camera is far away, then the renderer has a hard time figuring out which pixels of which poly to draw first, and you end up with erratic drawing that ends up looking like that.

Are you layering polys that way?