For the last 3 days When I go out in the morning or when my engine is cold and I start my car. I turn the key and starter kicks car begins to start so I stop turning the key like normal and it dies then the engine backfires really loud 1 time. This is my main concern I mean loud backfire like a gun shot. Then It'll start right up after that. It is like this everytime. This has been a consitent thing since it got cold a couple days ago. I read an article online that said if your engine is running lean it can cause backfiring. I do get an error code that shows I am running lean in both banks. I checked for vaccum leaks. I read an article that said your EGR can get stuck open?? I wonder how I can test the EGR? I could change my fuel filter again.