Mine would do that at the dragstrip after a run...or elsewhere after a run. My personal opinion is that it is the result of long tube headers and relocating the O2 sensors farther back. That could possible have them operating at less of an optimum temp for them resulting in some screwy signals to the ECU. The turbo setup is with flipped shorties so the O2's are in the stock locations and the car doesn't seem to have that problem.