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More than likely it is either your inner or outer tie rod out if it is pulling like that. ususlly the opposite sid eof the direction the vehicle is pulling. My Yukon was pulling to the right steering wheel to the left to keep it straight passenger side inner tie rod was shot. These things are easy do it yourselfers to replace and can be had hella cheap off ebay.
http://www.ebay.com/itm/271108408258?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
IE 32.50 for both sides inner and outer replaced at the same time. I like to go ahead and add new parts if one sides out the other is going to go sooner or later. In my case it was fairly soon as the grease fitting were already leaking on the driver side outer.
I may be a newbie here but I have way to much auto experience. IE ASE mechanic that specialized in suspensions. The only thing you need to swap these out is a jack, a good socket set, and a big pipe wrench maybe an hour of your time. Be warned it will drive like hell to the alignment shop. I actually recommned to do it close to the shop IE I drove around back of the NTB I went to and swapped out the parts myself.