Motor ideling

Asked by Jan 07, 2017 at 11:32 PM about the 1999 GMC Sierra 1500 SL Extended Cab LB

Question type: Maintenance & Repair

For some reason my 99 gmc kind of stalls
and begins to run like it wants to die while
the brakes are pressed idels normal any
other time only acts up when I apply the
breaks

1 Answer

100,525

Sounds like a brake booster leak if you have standard power brakes, if you have hydro boost brakes it could be the idle up system, it is suppose to bump up the idle slightly when the brakes are applied, but it is only the hydro boost system that has the idle up.

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