Hi Scotty, temperatures have gone up a little and I didn't mention this in the previous post but my hummer still occasionally switches gears and drives only short distance. It's not displaying the "ICE POSSIBLE" message anymore but its still acting the same. I've had a check engine light on for a while and I had it checked and it was the result of a bad "knock sensor" could a bad knock sensor be the reason of it rarely switching gears and only driving a short distance?