Recently changed upper motor mount and upper throttle arm, dropped wrench behind motor in process of changing motor mount, NEVER bogged until after wrench fell behind engine
What makes this problem better or worse?
Nothing
How long has your 2002 Volvo S60 had this problem?
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Did you retrieve the wrench? Certainly, it could have disrupted or damaged vacuum lines, electrical wiring, or even a component. It's too hard to say without hands on evaluation.