Coil,would be my first guess,but there are more things to know for sure,is it getting fuel?
I replaced distrib coil cap plugs rotar Wier's tested ignighter
Only ask to rule out other issue.
Have you replaced the igintion module?
Ok two things come to mind,the igintion switch itself,or the ECM.
Could it be crank or can sensor
Could be the crank or camshaft sensor
there is a small capacitor in the distributor that could be the problem. I bought it from napa when mine went bad. use the link to get an idea of what you are looking for http://images.oreillyauto.com/parts/img/medium/idi/37- 0103_primary.jpg
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