If the engine free revs, and the movement is poor, then I would suggest the transmission is slipping, you may want the fluid checked when cold. It would seem that 15 minutes is a long time for the engine to heat, these usually warm up rather rapidly. If you press your info up, and the on/off buttons together with the key on, all the segments will light up, and your info center will display ALL. Press on/off again and it will display ALL CODES. Press on/off again and record the codes. It will display them for each module in alphabetical order. The ones you are concerned with are PCM codes. There is a way to get straight to PCM, but it is easier to describe the ALL option. The info up/down will toggle functions, and the on/off button selects functions. Report which PCM codes you recorded, and we can see if they have any pertinence to your symptoms.
Wednesday, February 2nd, 2011 AT 4:00 AM