I had this on my previous car and usually when it just pulls to one side, it is most likely alignment. And I just came back from the Z shop to get a estimate for my rear drums but I asked the mechanic on duty about the wobbling at high speeds and he said that it could be possible that my suspension is set up with 0 toe in. He says that with 0 toe in the car just hunts for the grooves in the road, but he also mentioned that he believes it could be tie rods as well. He'll be doing a full car inspection by wednesday of next week, so I'll give you guys an update.