This thing has been a bear from the get-go. It ran fine sometimes and erratic sometimes, but recently it just quit. I guess it's about 15 years old. Pulled the plug and lay it against the engine, pull and no spark. So I buy a aftermarket coil from ebay. No spark. Got another from a different vendor with carb. Still no spark. WTF? What are the chances I get 2 bad AM coils? The original Stihl coil measures 1.7Megohms from the terminal to ground. The 2 aftermarket coils both measure about 380 ohms from the terminal to ground. I've even tried not even connecting the wires to the stop switch. No spark. Off switch works fine according to ohmmeter. Set the gap from 10 thou down to 6 thou and nothing. Magnet on the flywheel is strong, near as I can tell, it sure pulls the coil against it. Even tried 3 different plugs, the original, a replacement from the Stihl dealer and one that came with the carb/coil combo. Nothing. What's next, throw it out?