I’ve been dealing with the same thing, and sadly it’s one of IH’s major flaws with these tractors. I’ve tightened everything up on my 129 and it still has a mind of its own. For a temporary fix (probably permanent) I shoved a piece of fuel line very tightly on the butt end of the speed control lever and tightened the set screw to the spline shaft, and it has a lot of friction when you move the lever, but it doesn’t speed up on its own any more. I’m sorry i wasn’t able to answer your question properly, but there’s a little something for you to try. Been holding up for around a year so far, but it’s obviously like trying to put a band aid on a broken leg.
If zip ties and duct tape doesn’t fix it, something else will. ‘Jerry rigging at its finest’
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