My 2010 Ford Fusion stalls and loses power at highway speeds for no apparent reason. The car slows to about 40mph and this can be very dangerous while driving on a crowded highway where other cars are going faster and can easily cause an accident. After I pull off of the road and restart the engine it runs again. I called Ford corporate and they told me to have the dealer plug it in to their diagnostic computer. I did so and the dealer said the computer shows no record of a problem so they don't know what is causing the problem. I spoke with the Ford regional office and they told me that they will not assist in finding a solution. This car is too dangerous to drive and I may have to buy another car; certainly not a Ford. I note that other Fusion owners have reported this same problem. Can anyone help?