One problem related to car stall has been reported for the 2010 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2010 Toyota Sienna based on all problems reported for the 2010 Sienna.
In motion, when I let up off the accelerator to assess traffic, such as at the top of an on-ramp or other merging situation, then I decide it is safe to merge, and I press the accelerator, the vehicle stalls briefly before "catching" and accelerating. The engine doesn't sputter or cut off, the vehicle just sits still as though it isn't getting gasoline. I've had a few close calls when attempting to accelerate and merge into traffic. This isn't a gear down-shift/up shift type thing. . . Just a stall. It's not every time I slow down to coast, then decide to accelerate, but sporadically. I've had the van checked by the dealer and they couldn't find anything. I was told it's a "computer thing," with the computer getting confused because to doesn't know whether I want the van to coast to a stop or to accelerate, and "the computer gets confused. " I don't have specific dates.