steering fault?

Can anyone help . i just changed my lower wishbones due to garage telling me they are worn. on my ford escort 97 . But once i changed them the car when accelarating pulls sharp left, when daccelerat sways right why!. had alignment done changed tyers what else could it be it be plus it feels like the wheels are not touching the floor .when driving fast (60)mph onwards. very sesitive to any bumps