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There are two small rubber tubes that go from the engine to underneath the throttle body and back (recycling hot water from the engine), there is a mechanical temp sensor there, which opens the throttle a little bit on the cold mornings, but as the temp reaches it’s proper level, it closes the throttle to its normal position. If the water from the engine doesn’t get there as it should, the air coming through the throttle might lower the temp, causing the mechanical sensor to open the throttle, having a higher rev idle.
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