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You didn't specify the engine, so my advice is for a B230f.
An intake/hose leak will generally cause a high idle speed. You should look at the idle control motor. It's located under the intake manifold,
a hose come in from the intake and the other goes to the manifold.There's
a wire connector on one end. Sometimes you can tap it lightly when your having the problem and it will work. One way to test it is to disconnect
the connector to see if this will duplicate the problem.
Hope this gives you some help.
Roy P.
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