Has anyone had any problems with their trucks idle dropping to around 300 or 400 rpm and then jumping back up to 550 or 600? This seems to happen when you stop the truck and wait a minute or so when its still in drive, such as when your at a stop light or drive thru etc... Im going to make an appt with the service dept, but just wanted to see if anyone else is having this problem

 

I have seen this on my vehicle but happens at the 3-4K range.

 

I took mine to the dealer last winter for mine doing the same thing. Told me they couldn't find anything wrong. Seems like mine only does it in cold weather. Good Luck.

 

Mine does it.. Hasn't hurt anything, never dies. It is pretty annoying though..

 

same here, it drops really low for a second or so, then bounces right back up. Feels like its going to stall but never does.