Transmission Gear Indicator problems of the 2010 Ford Fusion

My car had 2 problems. First, was the powertrain transmission. It's the same situation as what others described, but my car started malfunctioning on the month we bought new and less than 100 miles. I don't have the specific miles and dates because I'm recalling from 2009 and it's now 2013. When I tried to change the gear from drive to park is when I first noticed the problem. I felt a sticking on the gear and a slight awkward movement of the car. I told the Ford service department where I bought it in elizabethtown, ky. Not sure when, but not right away and they didn't do anything. Then, a few months later, the car seem like it's changing gear on it's own, but I was on a flat road and have not touch the gear shift or not push the gas pedal any less or more, or braked. It did this a few times, so I took it, but again, the dealership did not do anything. Then, later, I made a right turn to a highway with heavy traffic, but clear when I entered. My car accelerated for a second, then just wouldn't accelerate anymore, and a car got pretty close. Finally, it went. I took it as soon as I can to a dealership in columbus, GA. Because an accident could have happened and was scary. But, they only checked the computer system. Nothing was done. Then, same scary thing happen on the highway again and again. Finally, I took it in 2012 and told them they have to fix this before we get into an accident. Finally, they fixed it after many times of trying and before an accident occurred. It was diagnosed with transmission problem and have not had any problem since 8-1-2013 at around 37,000 miles on it. This time it's the throttle assembly, but, they fixed it right away here in hawaii. This time it just loss acceleration while driving on the road. Thankful that my kids and I made it safely on the side of a busy intersection.