[AJT1961]

When my 2000 Blazer had those same symptoms it turned out to be bad ball joints, a common Blazer problem. How many miles on the vehicle? Ever replaced the ball joints? Check them for play -- the lowers usually go first, but given the amount of work involved, it makes sense to replace all 4 if you are doing the job. If that is your problem, spend the extra money to get oem or Moog parts unless you want to risk replacing them again in a year. There are some really crappy aftermarket ball joints out there.