06 Altima motor shuts off while driving.

I sure hope I can get help with this. I just had the oil changed on the car and also had the motor mount repaired as it was slipping. Now when I drive the car it makes a jumping noise, it's strange, and sometimes while you are driving, when you come to a stop light it just shuts down?? It did this today and now I know what my daughter is talking about! It shut down while we pulled up to a stop light and I have to put the car in Park and restart it!

What could this possibly be?

Pls Help!