SuperGCobalt

Hi guys! I'm new to this forum since I bought myself a Cobalt ss/sc 2007 and I really love the car ! I'm having a bit of problems with it but it's minor but i'm not new to mechanic ! I'm no expert though! Ok so here is the problem. I've been reading on this forum for an answer but didn't find any. I had a link kit (driver side) that was dead (the boot was off and all lol) So i changed it and decided to install my mags (stock one) at the same time! Since I installed them sometimes the car pulls a bit hard either left or right... I just changed 2 control arm bushings and a link kit. The car seems to act like that when there's crack in the road so I was wondering if it could be only that? I didn't act like that with snow tires and black rims though!

Hope you guys can help me!
Thanks a lot!