Totally Stumped

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Jan 11, 2003 | 08:30 PM

alamantrick

Thread Starter

New User

Joined: Jan 2003

Posts: 15

Likes: 0

From: Warren USA

Totally Stumped

Here's one for ya. What would cause a vehicle to idle smooth (slight miss)but when the brake is applied it jumps up about 500 rpm. When the brake is released it goes back to normal (slight miss). I am stumped. The vacuum checks out a-ok. (Thanks to alot of help from all of you) Everything else seems to be correct. I have never experienced anything like this. If anyone has any ideas they are all welcome. Thank you

Jan 11, 2003 | 11:43 PM

Torque1st

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Joined: Sep 2001

Posts: 30,255

Likes: 37

Totally Stumped

Either a leaking power brake booster, or a leak in a cruise control valve (if your truck has one).

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