Starter problems of the 2009 Chevrolet Impala

It will not crank I installed a brand new starter the ignition switch is the problem.

As I was driving to golf on Monday September 24th, on interstate I-80 heading west, my 2009 chevy Impala onboard computer stated the following, service traction control, reduced power, starter disabled and the check engine light all at roughly the same time. My car completely died and I had no power steering. Luckily I was able to coast out of harms way and get to the side of the road. I checked some wires under the hood and didn't find anything loose. When I attempted to start the car back-up, the onboard computer flashed, starter disabled. I sat with the car for about 15 minutes and tried once more. This time it started and ran normal, but the check engine like was on(still is). How scary is this really? enough to make me hate driving this car anywhere. Not to mention I'm a single dad of 4, who needs to get to work, school and many other things.

I was driving to work on the freeway then I noticed that my car's rpm started bouncing up and down from two and a half to two and back and forth and then my check engine light turns on and says engine power is reduced and as well as the service traction light turns on. I see that I have to press on the gas pedal a lot more further down for my car to stay at 60 mph and after 2 minutes of this my car's rpm drops to 0. My car turns off with the car reading starter disabled and service throttle. I had to pull to the shoulder. This incident had made me late for work and this incident happens a lot now. This can happen from once every two or three weeks to twice a week. Just recently my car's seat belts will become undone without anyone clicking the button for it to release. Also recently my service airbags light has came on.