I sorry you had this trouble. I too have Jacobs system. Originally I had it on my 258 and it was great .No more hard starting in cold weather. When I swapped in a 4.0 , they sent me the secondary trigger and new ends for the plug wires at no cost. I did have to have my coil reworked but that was my fault. They were very quick in returning the products and have always answered my questions. I will be testing them again because my wire ends are cracking after 5 years. Maybe they have changed. I hope not .