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 we keep her up with great maintenance and keep up with all the small things. But a week ago she did not start right away and I ended up putting a MAF and cleaning the throttle that help a little bit and at least ran but very badly. I 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. Then I recently replace the Throttle Body no luck it just cranks after that. Anyone knows what going on?

Thanks

 

checking out those codes it could be one of these.

coil pack ( one on every piston)
camshaft position sensor
bad egr valve