My baby won't start.
 

I have a 2009 Honda fit sport. It won't start. I have replaced coils, plugs, battery, Fuel pump, cut the exhaust and bigger air intake and I know if a couple other things I could try but everyone here seems knowledgeable about these cars. I have followed the page for some time. It would start for a little bit (2-3 times) with a little starting fluid and would miss fire and throw codes "Bank one too lean" I'm not sure what would be the best step next without it getting pricey.
can anyone give me some advice please?