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Your idle control valve may cause this.It is located under the front of throttle body.It is a thermostatic control device.Water passes through and heats up thermostat and closes air passage and idles engine down.You can touch the ICV when engine is hot and it should also be hot since hot water flows through it.Sometimes a flow restriction may be the promblem, if it is not hot when engine is hot you have a flow promblem. this unit can be removed and cleaned. It also can be adjusted internally by turning a spanner nut, the more you run the nut in it slows down cold idle speed.....

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14y ago
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Q: What causes very fast idle on a 1993 Toyota 4x4 pickup 22re?
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