Sounds like your kickdown switch is inoperative-when you push the accelerator pedal all the way to the floor, does it "click" when you press down that last little bit?

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"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo