I have a 25 year old Toro 824 snowblower with a Tecumseh HM80-155291M engine, carb 1099 D7V Series 3. The machine was just serviced - new fuel, plug, oil, fuel system flush, carb rebuilt and new belts. The unit starts and idles just fine. Under heavy load - the
auger full of snow and blowing - the motor seems to be starving for fuel. It will start to run rough, cough and if I don't back off ...