My st220 had this ' moosing' . I put a restricter in the hose that goes from the intake pipe to the throttle body. Moosing gone FOREVER! Your set up is slightly different to the 220. The hose from the intake pipe goes to the intake manifold near the idle control valve. VERY IMPORTANT: If you do put something in there to restrict the air flow make sure it is big enough that it won't get sucked into the manifold!
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