The car is a friend's. I just drove it and there is something wrong with it. It does not run smoothly, it jerks a little when you accelerate sometimes. I also noticed it when I slowed down and came to a constant speed. It seems to do it worse when you are driving faster, like on the interstate. I was thinking it could be spark plugs, but it doesn't do it consistantly. Could it be something to do with the turbo?