[Wa jang chang]

Friend of mine's 2001 Sienna with over 100K miles started giving him a problem last week. It started to stall when he stopped at the traffic lights. To avoid the stall, he has to press the gas pedal to rev up the engine while the other foot is on the brake. Took it to the shop but they did not know what was causing it. They wanted to disassemble the whole engine intake and other engine related items to troublshoot. Since they had no idea what to do to fix the problem, he decided not to have them do it there. Anyone out here have any clue on this problem/fix.

Wajangchang