1981 Chrysler Lebaron....

Not sure if anyone here might know about this car but i'll give it a shot. My grandmother has one that she uses as her daily driver. The other day it just wouldn't start. It turns over and over and just doesn't pop. the battery keeps dying. I am trying to figure out whats causing it not to spark. I am going to put a new coil on it but I fear that its the ECM Computer that is on the breather. Not sure if anyone out there is familiar with it or not but any ideas would be great.