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I was having the same problem with my 97 Blazer. The vacuum switch located on top of the transfer case was shot. It has three small vacuum lines on the receiving end and the other end has a ball bearing that gets worn out. $15-$30 for the part (I paid $30 but noticed others in this forum have only paid $15. I'm now having problems with the dashboard controls, but the vacuum switch needed to be replaced regardless.
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