Off the top of my head, I'd say airbox, not fitted properly, you got an air leak.
However it could be any number of things, (did you test it when you picked it up after the service?)
I've known the scotoiler vaccum to be taken off the fuel tape leading to fuel starvation cause it,choke plunger stuck, carb vaccum hole plug missing, or have you upgraded the air filter? (stick in a race filter without anything else being done and that's the same).
Of course could also be electrical, but that's easy to check.
Have fun .
Cheers Mark.
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