I know the answer to this one. It's a bad coil. My last two had the exact same symptom. I have so much invested in the attachments I can't just go buy a different brand. I've also inherited my brothers and my dads because they are so fed up with the problems they have had. You can still get spark but not enough. The coils are notorious for going out on these too. Coil runs like $56 but, learned its just better to buy a new one because something else will break and you will have your source of parts off the old when it does.