The idle gets raised to 1k rpm when that code pops. Clearing it will drop the idle back to where it normally is. P0300 is a real pain in the *** since the ecu uses it as a general catch all code when something weird happens. It very well could have been caused by the fuel cap before, and by something else this time. Clean tbs and mafs, and see what happens.
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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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