A while ago my 327 developed a vacuum leak. Since I was going to change the intake anyway I thought it would go away. Well, that didn't happen. I can't find the source. Anyone had a similar problem? The rpm is running high and the throttle plates are closed. You can put your hands over the top of the carb and it idles at a lower rpm. I have a friend that is a good mechanic and he can't come by for a week or so. I'm stumped.