why would the car start fine when cold and run fine until it reaches running temp? I have checked the ignition connections, idle control valve, vacumn lines and air intake..all seem fine yet after about 10 minutes the thing starts to stumble and will eventually die...every time...seems totally heat/engine temp related...almost as though the cold start valve isn't shuting off but i don'tknow..seems as though this is a classic issue..any help would be appreciated...no check engine light however so....thanks