Use a scan tool to check for the CTS and IAT sensors reading accurate temp and if they are OK, check the fuel pressure and for vacuum leaks.
December, 28, 2010 AT 9:22 PM
Something else I noticed this morning. My truck started and I stopped off at the gas station, went in, came back out and because I had my heat on full blast it wouldn't start. So I turned it back off, turned off the heater and fan, and it started right up. Think something is draining the battery besides the cold weather? It's a week old battery also.
December, 28, 2010 AT 11:45 PM
Have the battery tested if you suspect it. A parasitic draw is unlikely if the truck had already been run when this happened.