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Try cleaning the MAP sensor wire with MAP sensor cleaning spray (yes, there is such a thing-try Autozone). The sensor is located near the intake of the air filter and is a thin wire (be careful!). You will most likely have to take off the top half of the air filter box to get to the sensor. Be sure to disconnect any wire connections prior to removal. One of those connections should be the MAP sensor. After cleaning with the spray, put everything back in place and hook up wire connectors. Start car and see if that corrects problem. A dirty/contaminated MAP sensor will definitely affect your cars idle speed and smoothness of acceleration. Good Luck!

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Q: When you start your 98 Toyota sienna it idle slow but hit the accel pedal and it idles fine any help out there?
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