An EGR, or exhaust gas recirculation, system is designed to lower emissions by recirculating a portion of an engine's exhaust gas back into the combustion chamber. However, if the EGR system is not working properly, it can cause sputtering.
Sputtering occurs when the mixture of fuel and air in the combustion chamber is not igniting properly. This can be caused by a number of factors, including a dirty or malfunctioning EGR system. When the EGR system is not working properly, it can cause a build-up of carbon deposits in the combustion chamber. These carbon deposits can prevent the mixture of fuel and air from igniting properly, causing the engine to sputter.
If you think your EGR system may be causing your engine to sputter, it's important to have it checked out by a qualified mechanic. They will be able to diagnose the problem and make the necessary repairs.