I just replace my fuel filter and fuel pump on a 2006 ford five hundredand it still wont stay running. Any clue as to why?

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2006 ford five hundred Car was sitting for 2 years with gas in in, put additive in and has been running fine for 2 weeks. I drove 2 seconds up the street the other day and it sounded like it wasn't getting gas. We replaced the fuel filter first and that didn't help so we just replaced the fuel pump and I still can't get it to run.