HELP 2007 Q7 4.2FSI EPC
 

Recently my car threw up a EPC, traction control and CEL. Can hardly run and sputters. I pulled the following codes and was wondering if anyone knew where I should start? What would be the main problem as some codes get thrown since its running so bad.
P0087 Fuel rail system pressure low
P0102 Mass or volume flow circuit low input
P129B Fuel Pressure regulator valve N276 Bank 2 open Circuit
P2231 O2 sensor signal circuit shorted to heater circuit Bank 1 sensor 1
P2401
P2294
P0087
P0458
P2257
P010C