1997 Mitsubishi Montero severe wobbling right side (sounds

Shakes or Wobbles problem
1997 Mitsubishi Montero 4 cyl Four Wheel Drive 151000 miles
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HI .. My Montereo sport begins to wobble when
you hit 50 MPH , feels like it is coming from
the right passenger side, almost sounds like
a flat tire , or that you are going over very rough
pavement. The steering wheel shakes slightly,
what could this be??. We just got it back from the
shop for other repairs 1) fuel pump 2) lease
spring .. I dont remember it driving this way
when we brought it in .........Help ...
this is getting so expensive !!!!!!!!