I would like to buy a 2004 peugeot 206cc. When I took it for a test drive, I tried to accelerate to the point where it had to kick down to deliver power (goes in a lower gear with more RPM), and the car sort of "strangled", it didn't deliver the power it was supposed to and it stoped, I had to accelerate less fast for it to work. Any explanation ? And any idea how much this would cost ?