1996 gmc suburban

I recently purchased a 96 gmc suburban engine size 5.7 4x4. I had been driving it it for weeks with no problems. I went out to start it and it cranked but would not start. I checked the starter, alternator, and batteries. All were fine. I then had the fuel pump changed. It started and drove fine. A few days later the same thing happened. It would crank but not start. We changed the fuel pump again (thinking it was defected) but still no start. It turned out it was the fuel sending device. We replaced it and it started. The same day i had replaced it I noticed that after sitting for a few hours it was hard to start. It would crank for a few seconds before it would finally start. Once warmed up it would start fine. Then my check engine light came on. I plugged in the code scanner and it came out that it was the mass air flow sensor. That same day i was driving home from the shop and my car died and went back to cranking but no start. I am at my wits end with this never ending problem. Why is this vehicle constantly going back to the same no start problem? Is it possible that the fuel pump and the fuel sending device are still good and it is just the mass air flow sensor? Can that sensor cause my car to not start? HELP!!