Having problems with your 2000 Nissan Sentra ?
When I am idling my rpms jump up and down and then the car shakes and sometimes cuts off
The computer is confused and is trying to find a balance of air/fuel/exhuast. Normally this is easy for the computer because it gets all its information form sensor throughout the car. How ever if one of these sensors are not functioning the correct way it should throw a check engine light and tell you that the sensor is not working properly. If i were in your situation i would first check for a VACUUM hose that became un plugged or rotted....it fit all the symptoms and would an easy fix
Repair Help & Product Troubleshooting for 2000 Nissan Sentra
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