enigma-2

My girlfriend has a 2010 Ford Edge limited edition front wheel drive 3.5L V6 SUV  Bought it earlier this year  drove it for a few days and to hear rough sound from seemed to be the motor  a Service shop said timing chain had a good friend look into and felt that was Not the problem  after getting the car back it drove for a couple days then it just wouldn't start  I began the process of going thru things after spark plugs, new sensors, fuel pump assembly, new battery ect. Still won't start I pulled a spark plug and was dry couldn't see fuel on the piston looked dry  checked fuses and relays  it seems fuel injectors are not working because there is fuel at the rail  ?  Can Anyone Help !!