Question about 2008 Toyota Sienna

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I have a 2008 Toyota Sienna. When idleing the engine seems to surge, not a drastic surge but noticeable. The tach doesn't surge along with the engine..i'm wondering what this could be..

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Iac idle air control

Posted on Jan 31, 2010

Testimonial: "My vehicle is still under warranty. At least now i'll now what to ask about when i take the vehicle to the dealership. Thank you."

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This engine has a surge; AT 35-45mph,it's a bit more prounounced, not as bad, but still there at 60mph. As the tach goes up some, then down, so does the motor, up then back down, etc.Any ideas?


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My Sienna starts and revs the RPM's up to 2000 then idles at about 1200. It will constantly surge while driving at speeds under 55. Could this be the fuel pressure regulator?


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