With all the threads a while back about the fast idle, my is enabled. This past week here in North Carolina has just brought winter. I did notice this week while leaving my CTD running for short periods while running into a couple of shopping places, with the fast idle OFF, the CTD would automatically increase the idle rpm for a very short time and then would slow down. It must be sensing the temp outside as below freezing. Is this Dodge design or my TST? You guys noticed this?

My truck at www.GoRowan.com/2004ram

 

Mine does it also. I think it is normal and I wouldn't think that the TST would have anything to do with it, but I have a TST also.

 

Thats normal and is discussed in the cold weather operation in the owners manual.