Other Fuel System Fuel Injection System problems of the 2010 Chevrolet Malibu

I purchased the 2010 Malibu, used from the dealership- they were the owners previously. I purchased it in oct. 2011 and have taken it to the dealership 8 times in the 9 months of owning it. One time the entire driver side floor had 1+ inches of standing water in it, after a rain. The esc light continued to come on and off- they couldn't locate any issue- the first 2 times I took it in for that. The oil life sensor never went off for service- I was at 10,000 miles since the last oil change. I took it to my real mechanic to have fixed. The battery went totally dead in it one day- they said it had bad cells in it. And it would also stall, and when going about 40 mph not accelerate, on inclines. That's when the esc light would kick on, sometimes, and the rpm's would go up and down, all over the place. Finally made the dealership keep it until they figured out something- they kept it a few days, and called me numerous times asking me unrelated questions- they thought I was nuts, because they couldn't reproduce the issue. Finally- they told me a wire in the fuel injection had come loose. My car was so called 'certified' by the dealership- but I don't think they did any of the tests, or else they would have found some of these things themselves.