E420 said what needs to be done! If you dont floor it all the way till you click the switch under the accelerator pedal then you are not experiencing what your car can do. Stomp that ***** all they way and it should come alive like its on steroids! If it dosnt start checking your accelerator linkage, kickdown switch @ the pedal and all your basics like how old is your fuel filter? Everyone Ive driven hauls ass when you click that switch!

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ASE Master Tech, L-1 30 yrs Benz and BMW Experience, Working for myself as a Mobile Technician