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Help! My 2.5L 87 yj has an idle speed of 2k and jumps up to 2.5k when I press brakes. Plus brakes really stiff hard to press now??? Wth is up??
 

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After running your vacume pod should hold a vacume .should hear it by pulling off vacume line at booster.also there is a one way valve at that connection
 

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Disconnect the Booster and plug the vac line going to it. run the engine and see that it now runs as normal, and brakes are still hard to work. That's A Bad Brake Booster!

This would be a good time to upgrade for better brakes if you use larger than stock tires, on mine that was 205/75/15s LOL
 
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