I'm at a lose on how to fix this issue. I get this code intermittently for the pass several months. The engine has 125K on it. I've replaced the fuel injectors, coil packs and spark plugs since the code first appeared. When the code sets, the engine will start running rough. After 2 or 3 minutes at varying speeds the engine settles down and runs fine. I do not get a single cylinder fault code when this happens, only the P2308 code. Has anyone seen this or have any recommendations for trouble shooting? I greatly appreciate everyone's time that reads this and any suggestions that it might generate.