Engine Overheat problems of the 2011 Chevrolet Equinox

I was driving and came to a smooth stop at a red light and as the vehicle came to a stop, the rpm gauge needle fell below 1 and then kept lowering and the engine shook and jostled and the car engine died. All interior electronics were still working. I had to put the car into park in order to get it to start up again. It did this later while reversing. And now it just seems to do this anytime I come to a stop at a light, stop sign, anytime really. Something I found perplexing was that if I put it into park, it idles smooth. Take it out of park, it idles rough again and will stall. The information panel between the gauges says to service stabili trak. Last night, the engine overheated and coolant exploded from the engine. I have no clue what to do with this car. I have it financed and if it isn't repairable, ill be stuck with no car and no ride to work, but still have to find a way to make a car payment. I've been reading all over on different car forums and apparently this is a very common problem with other chevy Equinox owners. First it starts idling rough, then it starts stalling out, some people have even had it stall out while on the highway, and then one guy even had the engine catch on fire. He luckily jumped out of his vehicle just in time to avoid his own death. All of them describing the same issues my Equinox is having. The mileage seems to be irrelevant as far as this goes. Some of them had 30,000 miles, some had less than 5,000 miles. Some had 100,000 miles. Some of them took it to the dealer, and the dealership replaced cam shaft stuff. That sometimes fixed the issue, sometimes not. It just seems like there is definitely something wrong with this vehicle. Like something was wrong in production. Please help!!! I have children. What should I do?.