With a safe location outside, and the shrouding, if any, removed to get at the top of the engine, use a propane torch with the nozzle removed to test for a vacuum leak. The propane will supply fuel to the leak allowing it to smooth the stumble. Transmission vacuum control sensors diaphrams, and hoses are also suspect locations for leaks. Pulling hoses and plugging lines one at a time can also work. Intake manifole leaks (internal) will also make it happen. If it is a pair o fcylinders doing it, Pulling one plug wire at a time (stopped and grounded to the block before starting) will direct the search. JimN
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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