My defender wasn't starting about a week ago, so I was forced to take it to a mechanic. He replaced the coil & rotor (I just tuned it up, but he said the rotor was slightly off) & it ran fine, better than ever really. Previous to it not starting, it was sputtering a bit & it only got worse. Now it is doing it again, although not quite as bad. I will double check the coil connections & I replaced the fuel filter. Any other suggestions?