DW, if adjusting the valves solved the problem, albeit temporarily, it's possible that you have a loose connector somewhere in the system and you inadvertently, and temporarily, fixed the problem simply by reconnecting a poor fitting connector.
Whilst adjusting the valves you will likely have undone, and done up, various connectors. Think back as to which ones you did undo and check these for good fit. You could even do try wiggling each connector in turn whilst twisting the throttle in neutral to see if it affects the hesitation.
Just a thought, and a cheap, quick and easy diagnosis.
Garry from Oz.
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