Van was having issues getting into gear (out of Park into Drive or Reverse) so I took it in for transmission service to the dealer. Trans oil and transmission filter were changed. I was told that I needed some additional maintenance, they ended up doing (1) Throttle body service to clean Carbon and Fuel additive deposits, (2) Combustion chamber service, and (3) reprogram controller with latest calibration -- flash trans controller. Not sure if the controller flash is something to do with the transmission maintenance that they did or not. At any rate, the transmission issues in which the car would hesitate getting out of Park is fixed but now, every so often while doing low-speed driving, the car just stops. It is running along and then it just stops. No check engine light or hesitation, it just stops. Today, it started, then it stopped, then it started it a few more times and it would stop, all in a row, back-to-back. Once the accelerator was fully pressed, while in Park, it finally stayed on. The stops while driving along have happened four times in the last three weeks after the trip to the dealer. Any ideas?