Steering Rack And Pinion problems of the 2004 Chevrolet Impala

1) tried to slow car down. Car would not turn nor halt. Ended up hitting the vehicle in front of me. Restored it 100%. 2) a year later, had 3 brand new rack and pinion's replaced in one month. Had the vehicle checked out. The a-frame is in excellent shape and so is the area surrounding the rack and pinon. Have pictures and mechanics as proof. 3) called the chevy company & was told that the car was manufactured in wisconsin. They claim they saw no reason to help with the rack & pinion as those cars were recall-free. 4) car leans towards oncoming traffic at times (this started after each rack and pinion was replaced). There is also a 2 o'clock and 10 o'clock dead zone in the steering column. Steering used to feel a bit normal. It was not like this until I had a new rack and pinion put on. Twice (in between) the boot would excessively leak (as did the original from chevy). 5) when I turn the wheel out of the driveway, the car makes kick drumming grinding sounds. Was told this was normal. It is irritating though. 6) the car didn't even hit it's 5th year (being new) before it started to rust paint off the top of its roof. I live where there is no snow or coast, and extremely little ice. 7) the check engine light never goes off. Had it checked. Was told it was fine. 8) was driving right next to a cop going down a steep hill when the speedometer stuck at 10 mph. I crossed my fingers that I wasn't speeding since I kept my speed next to the officer. Replaced. 9) combo turning signal & cruise broke off the steering for no reason during a turn. Replaced. 10) locks me out off & on for no reason. 11) this car is my baby as it was one of the last thing I got that was my mother's before she died. It is also my first car that has seen me through (and still) my college years. It is very sentimental to me for those reasons. My dream is to keep this car even when it's a classic.