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

 

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

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[updated:LAST EDITED ON 01-12-03 AT 01:50 PM (EST)]Thank you. I will have to check them both out. I will let you know. Thanks again.