Quit screwing around and fix your intake manifold vacuum leak. Start by setting your idle speed to 550 RPM And then check all the possible leak points. You won’t be able to tell the speed change if you are “idling” at 1500 RPM.
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I'm gonna say no. If I advance my timing the vacuum goes up, retarding makes it go down.Is a 12-15 mercury reading at idle a guarantee of an intake leak?
I didn’t have a vacuum leak as far as I know at the carb/insulator plate surface, but when I pulled it the gasket seems to be soaked in gas. Is this normal or indicative of a vacuum leak?!I'm gonna say no. If I advance my timing the vacuum goes up, retarding makes it go down.