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Thank you for requesting me! I have seen a lot of cylinder misfires on this engine due to many things. The misfires could be caused by coolant leaking into the cylinders or carboned up valves. However, I dont have a listing for the P2097 code. Are you sure this is the right code?
This is a rich code. It indicates that the engine is running rich on bank 1.
This code comes from the oxygen sensor reading. If the engine is misfiring, the oxygen sensors are not going to be reading correctly. You need to get the misfires fixed first. However, to answer your question, rich running engine along with misfire codes could be leaking injectors.
Also, bad oxygen sensors can also cause the engine to run rich as well.
Oxygen sensors can also cause this slight surging condition while driving.. also a stuck open EGR valve
Thats good! I would disregard the rich code for now and focus on the misfires. Diagnose the misfires first and then go after the rich code if it continues