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The EGR valve doesn't like to get cleaned but will settle down and act normal pretty soon.
Do check that all of the vacuum lines are snug, including the air line to the air cleaner.
Take another look at the vacuum tree to inspect the lines and look for a good seal at the bottom.
You might want to take some butane and blow it around the intake manifold gasket to see if it mated correctly. If not, the rpm will race nicely.
Brakes work with vacuum, when the vacuum goes away, so do the brakes.
Klaus
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Why are Volvos so endearing? Its just a car.
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