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Hello, I am Randall. I have reviewed your question and working on it now. Will return shortly
Ok, what you describe is a vacuum leak. I cant say where but.. the most common is a bad PCV hose. they get soft in spots and kind of develop a hole in them. you have to inspect the PCV hose real close for soft spots. Its the hose from top of valve cover and runs under the intake with PCV valve on end. If ok,, then cleaning of throttle body is next. then if ok you ned to spray carb cleaner all around hoses and gaskets with engine running and when you hit the leak? engine will stall or run better etc here is pic of the hose