2002 GMC Sierra Rpm and volts drop when braking

2002 GMC SIERRA
90,000 MILES • V8 • 2WD • AUTOMATIC
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CHRIS7474
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When braking volts drop and rpm drop. I have to put it in neutral and rev it to keep it running. I had to replace battery and alternator and still doing it. Any answers?
Jan 14, 2010 at 10:54 AM
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JACOBANDNICKOLAS
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If the RPS's drop, that is most likely why the volts drop. Have you checked for a vacuum leak to the power brake booster?
Jan 15, 2010 at 12:35 PM
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CHRIS7474
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checked vacuum lines and tested. everything good. still wants to stall when braking.
Jan 16, 2010 at 12:14 PM
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JACOBANDNICKOLAS
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When you come to a stop, does the engine act like a vehicle with a standard transmission not having the clutch pushed in, or does it just slowly die without the vehicle stopping completely? Also, have you vacuum tested the brake booster?
Jan 16, 2010 at 12:39 PM