A simple way to do it is take some brake clean and gently mist it around the intake manifold and around the vacuum lines, if there is a change in the idle, then your leak is in the vicinity at which you sprayed the mist. Usually a vacuum leak will cause an engine light to be displayed on the dash, and also you will have an increase in idle.
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Monday, November 10th, 2008 AT 11:02 PM