Even if there's no CEL lit up, the ecu can sometimes have a pending code stored in there. That might help you get pointed in the right direction. Any strange noises?
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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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