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Originally Posted by mike2004tct
Both problems most likely related to bad vacuum lines.
Check all your lines from the manifold to the vacuum cannister, and
the line from the cannister to the transfer case.
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Like Mike says, check the lines from the source all the way down to the other end of the line, not just to see if both ends are attached. On my 89 S-10, there was a vacuum line that looped around the base of the distributor that actually had a hole burned into it where it touched the distributor, and resulted in a bunch of problems.