car wheels have play?

i have a ford escort 98. All origanal parts just changed the wishbones and had tracking done. But when i drive the steering wheel is straight . and the wheels tend to slightly wonder left then right . you can feel it through the steering wheel. Aslo when turning a corner you can feel up to a certain point the wheel pulling to lock to that side (like oversteering) and tyers make squeeking noises . I cant find the problem can someone please help costing a fortune in the garage getting things done that has nothing to do with problem

kev
August 2009