HELLO EVERYBODY OUT THERE, I AM WORKING ON A 2001 Nissan Maxima, and my problem is it is hard to start and when I do get it started sometimes it will idle down and shut down. Now every time I spray starting fluid it starts up right away right on the money. I was getting a code P0172 and P0175 I did change the fuel pump and fuel filter especially when I found out that this was the original fuel filter from 2001 and the gasoline came out black. I also did change the mass airflow sensor because it was giving me problems. At first when I did replace the parts I drove the car at 60 mi./h and drove it approximately 55 miles and everything was okay until I gave the car back to my friend and a few days later came back with problems I described on the beginning of this post. I hope someone can shed some light on my situation and it will be most appreciated thank you, Sir Tony