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While driving and stopping at a light when I press and hold brake my rpm's drop but not enough to die the car out. At times it will also vibrate a little. Why does this happen? I never had this issue before.
 

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Mine has always done this and never even thought it was an issue. Brakes work with vacuum assist. I don’t know how the brake master cylinder in the Juke is. My uneducated guess is there is what the engine perceives to be as a loss of vacuum when the brakes are engaged and thus the engine shutters and bumps up the RPMs to regain vacuum and stable operation. It’s similar if you were to just pop off a vacuum hose like on the PCV valve. The engine runs poorly until vacuum is restored.
 
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