Brake Sensor problems of the 2007 Chevrolet Impala

My car started having the traction control come on about 2-3 years ago. I was told I needed a new transmission. The transmission was cracked-Chevrolet said not their fault, so, I replaced the transmission. Then, it started doing it again. I replaced the brake pads. It stopped. Then, started up again. Took to the Chevrolet garage who put it on their total diagnostic machine. Told I need both bearings on the front. At a $972. 00 price tag for this, I bought the bearings and had another garage put them on at a great reduction in cost to me on labor. Now, it is doing it again. At first it was only every once in awhile. The wheel sensors appear to be fine. Now I notice it is doing it a lot more and starting to do it when I accelerate from a stop at certain times. I bought this car brand new, and, for its age, it does not even have 60,000 miles on it. (the date that that I am using in the next step here it began is the date when it really started doing its 'tricks' a lot more).

Steering spills oil and hard to turn rear brake tire pressure sensor is on.

The first instance I was driving and the "service brake system" flashed on the display. I had all brake pads replaced at dealer on 1/3/2013. 2/7/2013 I was in traffic and the car suddenly slows to about 10 mph and would not accelerate the dash then displayed "reduced engine power" and the check engine light came on. On 2/14/2013, I had the throttle positioning sensor replaced and at the same time had the rear defrost wiring repaired because that had not been working for over a year. On 3/4/2013 the car would not start by the factory remote start, so went out and started the car with the key, when I returned to the car the vehicle would not start at all the chime would sound the lights on the dash flashed but no start. I waited a few minutes then tried again, the car started briefly (50 seconds) "reduced engine power" appeared on the dash then it shut down completely. I looked under the hood saw the battery attachment was loose, tightened that up and then the car started up. However, the car radio (factory radio never replaced), the chime, or the ticking of the turning signals no longer work. I have an appointment with dealer on 3/14/13, but the car seems to be failing all around. In reading chevy/gm forums, there are thousands of chevy owners experiencing these same issues, chevy/gm needs to take ownership and investigate these vehicles to determine the root cause of the problems. Nearly 3000 dollars later in dealer repairs is not getting to the bottom of the issue. I was nearly in a crash due to the reduced engine power issue and that was scary enough to make me not want to drive this car or an at all.

My abs and traction control lights came on I was told it was my bearings. I replaced those and problems began again I was told it was my brakes and rotors and replaced those. Problem began again I was told it was my sensors, again I replaced those. Problem began again I was told it has to be the senor, another repair. All the while constantly needing tires (pressure lights also kept coming on) well abs and traction control problem began again. I backed up and car wouldn't go forward. It'll go forward in 1 n 2 I believe. Help!. .