Ok well it's been in the negative and single digits the past few days here in WI and today while normally driving through town, my alt. belt started slipping.

I get home and check it out and sure enough it's loose, but then another problem came about on the ride home. The idle started surging on me but only when off the gas. I'm not sure where to start looking as I am not familiar with these trucks.

If anyone has input on why it is doing this (current temp -2) please post. Could it be the TPS? EGR?......I'm thrilled that this happened to me just before I had to head off to work and even more thrilled that I get to try and fix it in even colder weather.

Also if it is a valve or sensor, please let me know if there is a way to clean it or if it needs to be replaced.