I was driving back down from Orlando cruising at about 70mph which is just over 2K on the tach for me and then I started to give it some more gas and the tach kept going up to about 4K before the car barely started to speed up. I pulled over checked the tranny fluids and everything was fine. Got back on the highway and it ran okay for about a half hour before it started again. I put the car in D and drove it fine for about 5 mins then switched back over to OD. pretty much repeated that for about 2 hrs. Im bringing it into GM tomorrow morning (thank god for that warranty) just wanted to know if anyone has had a similar experience or knows what it could be???