2003 Nissan Sentra

My car has a problem which is oil is leaking on one of the spark plugs cylinder. It makes the car shut down and slow down. How can I fix that? I've been trying to look it up on the internet but I don't find anything. It shuts down by itself sometimes then when I hit the pedal it starts not wanting to go it holds back which changed.
May 6, 2013.

One cylinder fouling will not cause the motor to shut off.

Check to see if spark is good. It may be a failing distributor. That is a common failure