Paula Tulsa, Oklahoma - 88 Ford Bronco
Paula’s car makes a noise-kind of a kazoo/whistle. It usually starts at 2,000 RPM’s, and goes up in 3rd’s as the engine revs higher. If she takes her foot off the gas, it goes away immediately. The noise seems to be coming from behind the dashboard. Tom and Ray think it’s a vacuum leak--could be in the heater control or fuel pump regulator. Should be easy to find if they cap off the relevant hose.