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Try to isolate the problem to one cylinder. Take one wire off of a spark plug. You want to do things in a systematic manner, so I would start with #1. Start the tractor and try to make it do the stumble thing. Problem no worse with wire removed from cylinder #1? You have greatly increased the probablilty that the problem is located in this cylinder or parts associated with it. Make a note of your findings. Problem worse? The problem is not likely to be with #1 cylinder or parts associated with it. In this case, make a note of your findings. Then, REPLACE wire #1 carefully. The idea is to only have one spark wire loose at a time so as not to mix up the firing order (1243). Next, run the same test on #2. Then, if necessary, repeat on the other cylinders, always replacing the previously tested wire BEFORE removing the next one to be tested. Also, remember to make notes. If the above procedure is run on EACH cylinder, and it is noted that the problem seems to get worse WHENEVER a spark wire is removed, regardless of which one, then the problem is very likely to be in parts and systems COMMON to all cylinders. This procedure also has the added advantage that in the process of running it, the condition of individual spark wires, the arrangement of wires for correct firing order, etc., are easily checked. The idea is to keep your eyes and ears open. Good luck and keep us posted.
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