We have a 2004 G35 Sedan. We have had luck running with us for 226,000 miles and not one problem believe it or not. Of course I keep her up with great maintenance. But one day she did not start right away and I end putting a MAF and cleaning the throttle that help a little and at least ran but very badly. Ck the fuel pump everything ok The codes I get now are as follow.0113, 0174, 0442, 0300. I did see if I could keep it running by shooting fuel into the throttle body and I was able to do that just that but as soon as u stop the fuel she dies and kinda tries to start again but never makes it. Just cranks after that. Anyone knows what going on?

Thanks