One problem related to speed control linkage has been reported for the 2006 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Ford Mustang based on all problems reported for the 2006 Mustang.
I purchased the vehicle on Saturday two days earlier, I drove to work then home approximately 130 miles went to dinner with a wife and friends. One of my friends from norway wanted ride in car and experience the power. Fortunately on a clear 6 lane highway I kicked it hard only the car continued to accelerate. The pedal functioned as normal returning to upright position. I kicked the pedal 8 or 9 times before the engine finally responded. It ruined a set brake pads. The dealer says that nothing is wrong with car - said the floor mat must have gotten stuck under the pedal. I said go look again when I bought the used car two days ago there are no floor mats in it. He had no further response. Second incident occurred today March 23, 2012 just over a year later basically a duplicate of the original. I think that these drive-by-wire cars have some serious issues regarding fail safe features of the components. I have experienced a number sticking throttles in my lifetime but at least when a mechanical linkage sticks there is an identifiable cause and remedy. This electronic crap and the lack of diginity by both the dealer and the manufacturer to respond to a serious safety concern is frightening. I bought Ford's Mustang to enjoy it - not be terrified that everytime I open the throttle that it may be my last. I have seen a number complaints on the various Mustang forums as well as on this site maybe Ford could at least honestly investigate the problem before someone is seriously injured or killed.