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Re: 1992 Buick Lesabre periodically accelerates during low-speed braking?
This could be a leak in the power brake booster, an idle air control (IAC) problem, or throttle body sticking. Have you tried to tap the accelerator quickly & let off, when this condition exists? Are you sure that the application of the brake pedal is the cause of the higher idle speed, or is the idle speed high when you apply the brake? A good way to test this, is to put the car in neutral, take foot off the brake pedal and observe the engine rpm’s when this happens.
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