because i have 2 sets of wheels and the car does the same thing w/ both sets.

 

Check the alignment, then. Also look for torn bushings and other bent or broken suspension bits.

 

If the wheels and tires have positively been eleminated as the source of the problem, then either the alignment is off, or something is torn, broken, or bent, and screwing up the alignment.

Once the car is aligned, I'd like to see the before and after alignment settings.

 

Heck, could even be that both left tires are low. It's not outside the realm of possibility.