I agree that it could be ignition coil - had that issue on a 9N with similar characteristics one time. Would work for a while, then sputter, then die. Come back a few hours later and run fine for a while, then die again. A new coil fixed that.
Otherwise, I noticed that you put a new kit in the carb last winter. Did that include a new main jet?? If so read on to what happened in my Oliver 550: Check that the hole in your new main jet is as large as it was in the old jet. Replaced one in my 550 in 1986 or 87 that was labeled with correct part # from Oliver/White. Tractor would crank, run fine at low rpm, but had to pull out the choke for it to run at working speed. Subsoiled, disked, and sowed 10 acres of pasture. Kept trying to figure out what was wrong as my brother said there must be a piece of trash in it somewhere. Still had the old jet (broken-wrung into two pieces when I pulled too hard on the wrench while tightening the jet!!) and happened to observe that the hole in the old one was larger. Drilled the "new" one out to the same size and the choke didn't have to be pulled out anymore!!
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