I just experienced this today. I had the truck in park, tapped the brake pedal, and when it started to come back up the engine idle went up breifly. What could this be?

 

Miked,
This is a new one for me....the only thing I could think of is somehow the brake pedal mechanism is in contact with your throttle cable/linkage. Take a close look under the dash and make sure nothing is in contact with the throttle cable.

 

I've seen leaky brake boosters do that before.

 

Agree with TRaGIK,could also be bad check valve at booster.

 

I will check out these things this weekend. Thanks guys

 

it may be something with the vacuum

 

Vaccume leak in the brake booster, replace the booster.