flickering objects and wierd object shading

[iDrinkHydrochloricAcid]

I'll try to make this as unconfusing as possible. Very often vanilla game and mod placed objects flicker when i'm too far away or will constantly flicker if meshed, or "fused" together. Its not a huge deal but it seems very annoying. The other thing is that when I look at an object without any or little light it appears to be dark, but when i approach it suddenly gets bright without transition from darker to brighter. It doesn't happen to every object in my game and only untill recently it started to occur. Again, its not very disruptive but a tad irratating. Any help would be appreciated.