while driving home yesterday my car just started decelarating even tho i had the pedal all the way down. Luckaly i managed to get it to the side of the road. Called roadside assistance and within and 2 hours they had it on a flatbed on its way back to my home. COuldnt go to the service because they were closed. Having it flatbeded to ralley bmw tommarow. What could this possibly be caused from? The car also seemd to be burning a lot of oil, filled it up 3 weeks ago and then just the other day had to put 2 quarts in.