As the car got progressively worse, what have your AFRs looked like? Was it all gradual, or was there an event?
Until you can get those plugs out, see what the old ones look like and get new ones in and maybe a compression test, I don't think we can tell you much.
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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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