[banddork123]

So heres the deal.. my 2003 PT Cruiser Limited automatic with 93,000 miles on it is acting up. When ever I am stopped at at red light I can feel the engine idling fairly rough. However, whenever I am on the highway, it runs just fine with no roughness. Could this be a transmission problem? And yes, my check engine light is on and began blinking one time while stopped at a red light. Please give me some advice!!