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The Montero has an automatic Idle Speed control. The idle is automatically set during operation by the vehicles engine control module. If the vehicle stays at the 2000 RPM idle, check vacuum lines for leaks, replace the fuel and air filter, and check the timing. All of these can cause the ecm to improperly compensate.

However, it is normal for the Montero to 'high-idle' often, especially when using the air conditioner.

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Q: Why does your 91 Montero Idle at 2000rpm when first started cold but turning on the AC will bring it down to a normal cold idle speed for 5 to 10 seconds before going back to 2000rpm?
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