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Q: Why does my car stall when i take my foot off the gas pedal? on 2002 Cadillac DeVille

the car starts right up. But when i put my foot on the brake to put it in gear it cuts off.
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You may have a hole in the brake booster rubber diaphragm. It will be exposed to air when you step on the brake, which causes a huge vacuum leak and then your engine dies. This is where I would start.
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