P0174 is Bank 2 Too Lean, right? And the P0300 is the random misfire. Maybe a bad O2 sensor? Switch the sensors and see if the code switches with it?
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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