This mission will happen immediately after the mission Meltdown. Jimmy is being taken hostage and will call asking for help.

You can choose to not help him, but that will cost Michael $10,000.

If you choose to help, follow the way point that appears on your map.

Once there, you will need to destroy the captor's vehicle.

Ram the car or shoot out the tires, but do not kill them.

Keep doing this until Jimmy's captors stop the truck and flee.

Now, drive Jimmy home, listen to the funny conversation and the mission ends.