Sounds like either the pump has air in it and is not self bleeding as it should or your pump is failing. I am guessing you have the ps pump with the 2 vacuum lines on. Those lines really dont do much. heck if you remove them you wouldnt even notice. Most of the time hard steering to one side and not the other is due to low pressure. It also could be your steering box or linkage is binding up some where but if it was I am sure you would have heard it. Find another pump and see if it helps 1st.
