Q: how do i replace my motor mounts? on 1994 Pontiac Grand Am

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my motor has been shaking really bad for the past 6 months and now when i start it, it shakes for a second and cuts off. i was told by advance auto parts that my motor mount is broken. i replaced the one by the left front tire but its made no difference. i was wondering how many mounts are holding my engine, how you go about replacing them, and could the broken motor mount be causing my engine to cut off.
(1) Answer
The fact that your motor dies has little to do with an engine mount unless you damaged the wiring harness. Really need to find that problem first. Any engine lights on? If so need to check for codes and do a detailed diagnostic. The advance auto folks mean well, but they have no training in diagnosis and repairing a vehicle.