09 Altima 3.5SE 6MT Sedan
Is there any chance you just have some ice crystals in the gas line...ie has it every been above freezing for long enough for things to thaw out a bit (sounds like not according to your fingers...). If not, and assuming you have no block heater or other means of introducing reasonable and mostly safe heat in the area (keep in mind, it's filled with gas right?). You could pull the defunct cyl's injector wire (so it doesn't squirt gas), and run the car on 3 good cyls for 1-2 min, shut off and throw some old blanket or whatever over top to trap what heat you generated and close the hood...give it 1/2hr, reconnect the injector and try again. With luck...any crystals will now be liquid water and get flushed through the cylinder...the dry cycling and heat will help to dry out the defunct cylinder too. Adjust idle time for heat generation upwards as the temperature plummets but don't run it like that longer than you have to....it's pretty ghetto.