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twice Toyota replaced the idling valve assembly in my 2001 sienna van, under the 36,000 mi warranty, since then I've had it replaced another 2 times. the mechanics say it's a defect in camryand sienna vans. so my last mechanic advised me to use better brand gas like chevron, which i guess helps coz i used to put any type from arco, vons, Costco, generic types. when the idling assy is replaced, it starts and idles fine, assy alone costs about $220-260+

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Q: What causes a 2002 Toyota Sienna to start but not stay running?
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