My 2007 Nissan Sentra will start but want stay running. What could make that happen?

Unfortunately, plenty of things. Is the engine sputtering before shutting of or just stopping like if you would turn off the key?

2009 Sentra: I had the same problem as many Sentra owners had. Started car and when put in drive or reverse it would spit and sputter and eventually stall. This got worse over about a six month time period. Changed all kind of things. Eventually found the 4 inch plastic intake hose near the MAF sensor had two splits in it. I couldn't see them until I physically moved it. Everytime the engine would torque in either direction they would open up and the car would run extremely rough or stall. replaced the intake hose and car runs like new! Hope this helps some one.