I own a 2002 Mercury Cougar v6 aand for the past few months been having problems with starting it. First i got a new battery and after awhile i continued to have problems. Id always have to jump the car to start it up. Then it broke down and had it towed. They couldnt find anything wrong with it. So i drive it home and its working for a few weeks and on friday i tried to start it up and yet again it wont work. What is wrong with it?