I don't have a running on problem but if the problem is due to carbon buildup this product might work. My son's van failed his emissions test and at my suggestion he went to the neighborhood autoparts store and got it then he added it and went back to the inspection station(half hour drive), and was tested again and he passed. The guys there couldn't believe it and rechecked his van twice. It's advertised on that Saturday morning show talk show "Wheels, with Ed Wallace".