Stihl BR400 engine question.
I have a Stihl BR400 backpack blower. Engine has become hard to start. Once started it will run to a high RPM and then quit until the RPM drops, it then starts hitting again and returns to the high RPM and repeats above. I have checked the gas tank cap, fuel filter, gas line, air cleaner and carb, all are in working order. I have replaced the spark plug and the exhaust screen is clean. I am thinking the coil may be breaking down at the higher RPM's. I would love to hear from anyone who has experience with Stihl products.