Hello Just bought a Chrysler Ypsilon 2012 0.9 Auto off of Gumtree (I know asking for trouble). When I was driving the car back I went to join the motorway and put my foot down and and the car started to loss power and judder until I took my foot off of the accelerator, it does it every time I try to accelerate hard, the last time it happened a message popped up saying stop start malfunction discounted and I can not be reconnected by pressing the button on the dash. Can anyone give any help on what might be the fault. Thanks