Was the problem occuring before you got the new tie rods? Because I used to have this problem too due to uneven tyre wear on the inside of the tyres. Maybe check your tyres. No it wasnt a problem with it the mechanic just told me to get new ones coz the rubber was worn ;) i changed a tyre which was worn on the inside but not the out side! on drivers side is abit better but not like how it used to be .b4 i could let go of the steering wheel and it go straight not it wont lol