2001 Oldsmobile Front in shakes when driven had higher speed

Other Category problem
2001 Oldsmobile V6 Front Wheel Drive Automatic 109000 miles

I have an Aurora 2001. In the last year I have had to replace the rims (due to the fact tires would not hold air); recently replaced brakes, struts and shocks. There is a leak of some kind the shop that worked on it thought it was power steering fluid which they thought it was because something was loose. However after a week the car started to shake again and it is still leaking. Taking it to my regular mechanic in a couple of days. Concerned about the cost of this repair and what it could be.