I have the definitive answer to this , It is the throttle flap sticking in its housing , this is usualy accompanied with no power at all and some black smoke and knocking for a few seconds until the vibration frees it off .
I'm surprised the dealers are is struggling with this , its a known issue and has a bulletin on it .. Change the plastic throttle housing and see how it goes ...
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My comments are only based on my opinions and vast experience .
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