Purchased a 2006 Pt cruiser 2.4 l turbo. When vehicle is started it runs extremely rough at idle and then it smooths out when accelerator pressed. When you come to a stop you have to press the acelerator softly or car will die. Once at highway speeds the car runs great until coming to a stop then car wants to die. I've taken it to auto zone to have a diagnostic run but it shows error instead of codes. Im not a mechanic . Can someone please help me. What should I check first.