i just broke down, had a buddy tow me home. i have fuel and air, but now no spark, was runing fine all day but just went dead. it turn over fine, full battery, no spark!. i have 12 volts to the coil, and it reads 12 volts from off the coil wire, distributor looks fine, points good. i checked and i cant get a spark on the block from plug wires, or the coil wire. well im not sure now what it could be, a bad coil? howcan i tell for sure.