fuel pressure regulator, try to just turn the key to the on position, do not try to start, let it sit for 3 seconds, and then turn off and back on for 3 seconds and off, on again for 3 seconds and then off and then try see if it starts, if it does, it is the pressure regulator/fuel pump. Fuel pump could be having issues when it is cold too. When was the last time you had a tune up? Plugs, wires, cap, and rotor are also problem areas in the cold. Tim