although tis isn"t a garden tractor question there is enough small engine people here. i have a husqvarna 61 chainsaw. when you start it, it idles and bucks like it has a miss. I have taken the flywheel off making sure the keyway is in tact,it is. bought some extra parts from ebay. changed the module and coil. it has the 2 piece set up. taken the carb off and checked for cracks on the intake and the cylinder. taken the muffler off and checked the inside of the jug, doesn"t look like the ring is cracked. jug is nice inside, no scoring as far as I can see. the on/off switch is not connected to take this out of the loop. what am I missing. any help. thanks