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Old 10-29-2012, 03:13 PM
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only thing i can think is from old cars.....some had a vaccum switch on the brake pedal and although rare cases when stepping on the pedal you make a bad ground good. if the vaccum hose to the booster is disconnected and plugged AND the pedal still changes the idle i would look for some type of vaccum controll on the pedal. imho
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