Manifold/header/muffler/tail Pipe problems of the 2010 Chrysler 300

On thanksgiving 2012 , I was coming back from out of town and driving on a highway when I looked in the rear view mirror and noticed a bit of smoke. I thought it was because the night was cold it appeared as if smoke was coming from the back of the car. However, after noticing that the smoke got a big bigger, I pulled off the side of the road. I opened the hood and there was fire coming from inside the hood where the engine was. I ordered my family including my 2 year old back out of the car as I thought it would explode. We waited until the fire department arrived but by then the flames subsided. I waited about an hour and half in the cold for aaa to tow my car 154 miles. I still have the receipt for the tow up to this day. Took it to Chrysler dealership and was told that they had no idea what caused the problem. Took it to aamco and they said a plug was missing and engine oil leaked out on the muffler and caused the fire. Next incident, car started stalling on me several times. Took it to a repair shop and was told the computer needed to be re-programmed (April 2013). A week after getting the computer fixed, the car started stalling again and this time I was told it was the alternator. Got that fixed and 3 months later, the car started stalling again. This time I was told it was because I needed a new battery. Got the battery put in and then in June of 2014, I was driving on a highway and the steering wheel locked on me and the car shut off. I smelled smoke like something was burning. After getting independent diagnosis from three different dealerships and automotive shops, it was determined that my engine completely failed. Got the engine rebuilt and as of Saturday Jan 24th, 2015, car started stalling again but this time, only when I come to a complete stop. Something is definitely wrong with this car! help!.