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Hello, my name is ***** ***** I am a professional here at Justanswer. Thank you for your question and I will assist you with your concern.In order to help you I need to know what model your working on please.And also can you clear all of these codes and then rerun the engine and recheck and see which code reset and post back with them and we can work from there.
You can clear all codes by disconnecting the negative battery cable for a few minutes. Once you have done this, restart the engine and let see what code reset. Post back with those and we can work from there.
If you smelling gas then you either have a leak in the system or you have an EVAP system leak.
A back fire is in most cases caused by either a valve timing concern and or an engine misfire and yes if the engine is running to rich it could cause a backfire.