Sorry if I didn,t describe problem correctly. In normal mode or in sport mode when sharply pressing pedal to floor the kickdown comes into operation & car drops down to low gear & speeds up rapidly(as it should). It should then slow down & stop reving so highly once you take your foot off the pedal and/or brake. However it does not, it continues to rev high & speeds the car forward uncontrollably. You then end up with the throttle sticking open to its full extent & the only way to stop the car is to switch off the ignition key & brake heavily.With normal(non kickdown) driving the throttle acts as it should & operates without any sign of sticking.
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