A system is disclosed for actively controlling combustion in a gas turbine engine (10), which includes a fuel injector (110) for issuing fuel into a combustion chamber of the gas turbine engine (10). The fuel injector (110) has a dynamic pressure sensor (130) for measuring acoustic pressure within the combustion chamber and a flame sensor (140) for observing flame characteristics within the combustion chamber. The system further includes a high speed valve assembly (112) for controlling flow of fuel to the injector (110) and an electronic controller associated with the fuel injector (110) for commanding the valve assembly (112) to deliver fuel to the fuel injector (110) at a commanded flow rate, based upon input from the sensors (130,140) in the fuel injector (110).