My name is Robert Richert. I own a 2002 Toyota Sienna, 122,000 miles. Lately, but at irregular times, the car stalls when I start it. I have not yet brought the car in to have it checked but this problem has happened three times previously (2005, 2007, 2009) and it was due to the idle speed control valve. Hooman Toyota of Long Beach repaired it each time. I called a service rep about this issue yesterday and have not received an answer as to why this problem continues to reoccur. I do not know of anyone that has experienced this problem one time, much less four times. Is there a technical service bulletin on this issue? I want this problem resolved correctly. Please advise.