IAC (Idle air control) valve stuck, very common. Some come apart (most Fords for ex) for cleaning, carb cleaner in the vacuum control line may help. It senses engine temp and increases the idle speed accordingly to keep it around 900rpm no matter whats' going on. If you turn the wheels, a pressure switch in the power steering high pressure line will increase rpm so it doesn't stall when parking and you do not have to add gas, turning on the a/c will trigger the IAC to increase rpm as the compressor draws power............ Just a couple of examples. Easy to find
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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