OK heres whats goin on, i bought an 82 datsun 720 from a guy who had left it on the deer lease for 2 years from what he says the engine had to be re-built so that was doen about 100 miles before he ended up parking it. So we get there and the truck had a huge nest from some sort of critter in it but we seen no major issues and bought it. We get home and replace the battery and still wont start and so we figure out it aint getttin fuel so it ends up these critters had chewed about 16 of the wires up goin from the can through the firewall so we repair all that and it starts gettin fuel and it still wont start!!! We had already replaced the plugs, wires, cap, and rotor, its crankin over but it aint gettin no spark except when u quit crankin itll backfire. Me and my mechanic think its the ignition control module, but we aint sure, so im hopin you fellas can halp me out, thanks!!