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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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