Whenever I enter into a car (to drive), first I see smoke coming out of the engine** and the car gets accelerated automatically. This really irritates. Also, most of the times, Niko staggers even though he isn't drunk. These make game so very uncomfortable to play.
How can I fix these problems?
I had face the same problem. How ever I overcome it. For you my suggestion is don't save the game when you are in cousins apartment. If it don't work, then start the car from the beginning (from the port) don't follow the road map drive different way. Make a lot of crime. Then after hero's death drive accordingly.