It's not hard to imagine that there is no good reason to have a neutral safety switch on a car that uses the neutral button as the starter switch. Think about it. There is, however, a vacuum switch on the intake manifold that prevents the starter from engaging if the engine is running. It's just so much less commotion when you hit neutral to park the car. If the vacuum switch isn't happy, you'll have trouble starting the car. Replace it, and all should be well. Cheers, Roger