Hey, I am running against a problem in my gt, this typically happens when the car is in 4th, it's a 5eat but I have used the tiptronics to check gears. When is at 2k on the tach, no matter how heavy or light I press the accelerator, it will barely accelerate until it hit around 2.5k then it will jump up fast. I was also smelling a light burnt oil smell today that went away after a little bit. THe car recently had a valve job done on it and the head replaced, along with a new cat. ANy thoughts or help would be greatly appreciated!