acceleration up and down whwn applies brake

1992 TOYOTA PICKUP
100,000 MILES
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SALBERTS
  • MEMBER
  • 1 POST
when apply brakes acceleration goes fast and slow.when let up on brake accels high. chked booster vacuum ...the acceleration changes when applieing brakes.
when applying brakes thw idle lopes up and down .when i let up on brakes idles normal
Jul 5, 2013 at 11:29 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
You must have a vacuum leak somewhere. Check to see if there is one on the intake as well as the hose going to the booster. If you can't find anything, check manifold vacuum to make sure it is within the manufacturer's specs.
Jul 5, 2013 at 12:09 PM
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