In this research, a boosted current spark strategy was proposed to improve the combustion stability and controllability of lean burn spark ignition engines. Firstly the boosted current spark system was tested under pressurized and different flow conditions. Results showed that the boosted current maintained the discharge duration and current level in the flow and pressurized conditions, especially when the current level was high. Then methane air mixture was ignited in a combustion chamber to study the effect of the boosted current on flame propagation. The results showed that the boosted current had negligible effect on flame propagation under quiescent conditions. However, significant improvement was observed with the boosted current spark ignition when the combustible mixture was under flow conditions. Lastly the boosted current strategy was used in a spark ignition engine operating under lean conditions. The higher current level with the boosted current strategy improved the operating stability and the controllability of the engine. With an air excess ratio of 1.5, the boosted current strategy was able to maintain stable combustion with proper combustion phasing while a normal spark was not sufficient to maintain stable combustion.