I did a quick search for a rough idle but I didn't see anyone that was having the same issue as I am. When I start my car and drive around town, it idles perfect and runs great. Most of the time when I've been on the highway for a while and I exit the highway coming to an eventual stop, my idle is extremely rough and the truck feels like it wants to die. The RPMs jump from like 300 to 900 or so. Any reason this might be happening? The speed doesn't seem to be a real issue as it will do this if I've been driving at 70 or 80 and the same goes for the PWR button being on or off. No difference