2007 Ford Taurus code P0171 what could cause this code and every cylinder is misfiring

Question

The car was driving down the road and just died and won't start I had done a tune-up plugs wires and coil pack and that didn't fix it also has given me the codes for each cylinder misfire, so I'm lost on what to try next

Answer 1

P0171 Fuel trim lean Bank 1

P0174 Fuel trim lean Bank 2

You would need to do a fuel pressure test. Other than that, there is a big vacuum leak, on the fuel rail there is a fuel pressure test port, just like a tire pressure shrader valve. You would use a fuel pressure test for a Ford.