Gas Recirculation Valve (egr Valve) problems of the 2013 Buick Encore

My car drove fine and then I stopped at a red light at a busy intersection when my traction control and check engine light came on and the engine power reduced came across the dashboard. The lights, wipers, radio and engine was still running but when pressing on the gas pedal the car would not accelerate. I had to wave people to go around me put it in park and shut it down for 30 seconds. When I turned it on again I had to put it in reverse and keep pushing the gas pedal to get out of the intersection then I put it in drive and just kept pressing the gas pedal and inched my way into a parking space. After shutting it off and parking it for 2-3 minutes I turned it on the check engine light stayed on but the car drove like normal to get me to the dealership. I got this car in may of 2013 and the first time it happened was Feb 2014 pretty cold temps and now April 2015 about 56 degress f outside. Both times the dealer replaced the throttle body and performed idle relearn procedure. I don't have time or money to replace this part every year. I loved the size, gas mileage, design and comfort of this vehicle, however I won't be buying another general motors vehicle again. I always owned gm vehicles but not anymore I simply don't feel safe.

I live in minnesota. On a -30 degree day in January I drove to work (30 miles one way). When I left for lunch I drove about a quarter mile and started smelling a burning smell similar to when following a vehicle that is burning oil. My car was new so I didn't think it was me. I went about 2 miles and stopped for a stop light at which point my engine started to sputter. I put the car in neutral and when the light turned green shifted back into drive. I managed to pull out of traffic and with black smoke coming out of the tailpipe, the car died. It was towed to the dealership and strangely it was the second Encore that day with the same problem. After sitting in the warm garage over night, the technicians could not recreate the problem. The diagnostics showed nothing. I picked the car up after a few days and it was fine for two weeks. Then on another bitterly cold day, it happened again. The car started to smell, blew black smoke and died. Again it was towed. At that point a gm engineer out of minneapolis came up to assess my car as well as some others having the same problem. This time parts were replaced including the throttle body sensor and some air intake parts. It appears as though it is not uncommon in colder climates. I have been on the Buick forums and have found other incidences documented. The problem is that the replacement parts are the same parts that failed before so this is a patch not a fix. Next winter this will happen again. It is awful to have a new car that I can't trust. I'm nervous every time I drive it when it's really cold. Next time it could die while I'm in traffic on an interstate or I could be stranded somewhere in dangerously cold temperatures.