Vacuum leaks are sometimes hard to find. It could even be the intake gasket that you hear. Some people will spray starting fluid in the area that they feel is leaking. When they hit the spot of the leak, the RPM's will go up. You can try that, but be careful because starting fluid is very flamable and can cause a fire if you hit a spot that is very hot. Try that to locate the leak, but have a fire extinguisher near by.
Let me know if this helps.
Joe
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Monday, November 2nd, 2009 AT 8:03 AM