How do I test for vacuum leaks?

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My daughter’s 2012 versa has the worst vibration I have ever heard. When the transmission is in park the motor is vibrating, the fenders, hood, dash, doors and everything else is shaking. Usually won’t do it at startup. If you drive it then stop the vibration starts. I was thinking rough idle so I replaced plugs. No change. To replace plugs I had to remove air intake manifold, throttle body etc. Now I’m worried I might have a vacuum leak. I hear air. I’ve had new CVT, new upstream air sensor replaced. Car has a catalytic converter code. Any suggestions as to what I need to do?? This car sucks. I need it though.

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Jsparks450

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Posted: 3 years ago
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