I recall this happening on cars and light trucks in the early "70"s when the idle timing was retarded and the carbs leaned out for emmission control. The fix was an idle speed solenoid that shut the throttle plate completely when the ignition was switched off.
I would check the timing to make sure it is not retarted at idle and that the idle and main jets are the correct size and then look for air leaks that allow air to bypass the carb metering section.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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