[aznatama]

So let me get this straight... you were tailgating, the car moved over to the right, and you sped up going straight, then the car felt like it turned to the left?

Probably a combination of wind turbulence and some slight loss of traction due to road conditions, or you just hit a dip or tracked a rut in the road that you didn't see.

You don't "oversteer" going in a straight line, unless you were cornering and the rear slid out.