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If it is an 83, you need to look into the points set an condensor. The ignition system works on an old fashion sysem, no different than 1955 automobiles. Points and condensor should be changed yearly regardless of hours, as the ignition system actually "wears and tears" and eventually will quite working with age and engine hours.
If you go by the book, Items such as points, condensor, cap, rotor and plugs should be changed yearly, again, regardless of hours. Spark plug wires every 3 to 5 years depending on useage and climate.
There are a few other things, but this is the most likely problem, an old fashion tune up. Start with this and if it does not fix it let me know and we can dig further.
Post right back here with any additional questions or concerns my friend.
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