I bought an 06 SS with 62k and when I go to take off from a light or stop sign my car moves very slow rpms jump up and im going nowhere the real quick it kicks into gear and jumps forward. The first time it happened my tires squealed. Its pretty random I have not seen any trends that could be causing this. I just had the engine rebuilt so I think I can rule that out and I dont want to keep running in and out of the the auto shops. What am I looking for to solve this problem?