I have a Toro CCR2000 Snowblower that's giving me ignition problems. I got it out first thing this winter and it wouldn't start. Checking things out it appeared that there was no spark. Hooked up a timing light. With the spark plug grounded, not in the hole, the light showed consistent spark. Then I put the spark plug in, just lightly threaded and no spark at all. I went through this procedure several times and consistently with the spark plug grounded outside the hole, good spark, but when spark plug inserted in the hole, no spark at all. Please help with any ideas. The engine is a 2-cycle suzuki engine I think. I changed the module but no help. I tested for spark again today, this time without the carb or fuel tank. The results were the same. With a new spark plug grounded, a strong spark. Then with the spark plug torqued, no spark at all. All switch wires disconnected, and contact points cleaned. Prior to testing I checked primary lead and coil grounds using an ohmeter. The snowblower is a Toro CCR 2000E, model 38186, S/N 2000151 . Prior to the last tests, I did clean the carb using a commercial carb cleaner bath. Although as stated, the last test was without the carb installed. My next course of action was to disassemble crankcase, first removing flywheel checking for a partial sheared flywheel key. Nothing wrong with key found. If nothing else this will provide the opportunity to thoroughly decarbon.