are you sure that the throttle gas doesn't keep open the throttle valve???
other problems could be:
- the minimum screw(normally right side with a visible spring on its thread) this keep the minimum rpm high... try to unscrew it
- a carburation problem... maybe the minimum jet is too small...
- somewhere in the engine the sealing is not good (is the last option usually when is so the effect is not so strong..)
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