I was reading another post on this website, about someone having trouble with his Pertronix III, about a year ago. I had been running a Pertronix II for years and thought the III must be better......and perhaps the other person may have other issues or limited mechanical skills. Well, that's what I thought anyway. I went right ahead and purchased the newer Pertronix III, even though my original II was functioning well. After installing the new III unit I took my car for a little test drive. The car started right up, everything fine. I got on the freeway, was crusing at around 60, and wanted to feel how it ran under load, so I accelerated firmly avoiding passing gear and...….nothing. The engine just quit on me on the freeway. Good luck helped me pull over to a stop on the shoulder through the traffic and I had a flatbed haul me home. I re-checked the wiring for any connection issues but everything was good and still no spark, so, I yanked the brand new III unit out, re-installed my old II unit and it lit once more. After 15 minutes of use that @%#$#& Pertronix III unit was in the trash can and I ordered a new II unit, which I put in and has been fine. I just had to find the original post on this site and contact the person who warned the readers, just to tell him my story and to let him know how right he was. Avoid the Pertronix III.