Ok i was driving to work yesterday and the car started to sputter some and then made like a banging noise from the engine. I then stopped it at work and left it there for a few hours. I went back and the car is running fine again but the check engine light came on. It pulled 31 O and 31 C codes. This is for the EVP on the EGR. Would this cause this problem. I just recently changed injectors to 30#ers and to a Pro-M77 for them. I dont know if this is related or not? Any help would be greatly appreciated.