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You either have a bad vaccum line to brake booster or the brake booster itself is bad

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โˆ™ 2006-05-05 01:15:53
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Q: When you push on the brake on your 91 firebird with a 3.1 V6 the RPM increases but when you let off the RPM dives down to around 300 and sometimes dies. What could be causing this?
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