All sorts of things although, generally, it's different length drive shafts. This means that each shaft is receiving a different share of the torque created by the engine.
This can be helped by an LSD.
You shouldn't have this on a 4wd car though, the above will apply to fwd cars.
If you have these symptoms on the GTiR, check your tire pressures to start with. You might have a seized brake caliper maybe ?! If none of these, get your alignment checked.
It could even be the road you're using. Ruts caused by HGV's etc... can cause havoc with the way the car handles on the road !