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Sounds like a severe vacuum leak. Can also be the power brake booster diaphragm is busted. Check all vacuum hose connections and look for a crack in a hose. Also check the booster to see if it will hold vacuum.

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12y ago
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Q: Why would your car's RPM drop off when you apply brake and then return to normal idle speed however when it drops off when brake is applied it idles very rough before returning to normal ideal speed?
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