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OK - I'll go along with it - if you think the transmission is at fault, why not measure the working pressure?
You might see a change in working pressure that coincides with the stuttering.
Generally speaking if you have an out of balance rotating vibration it will get worse and worse with an increase in rotational speed. As this is between 800 rpm and 2000 rpm I wouldn't expect vibration to be the cause...
...different tack...
...have you considered fuel line and tank? {Try a different smaller fuel tank / fuel supply to see if it's that)
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