My car overheated one day really bad and shut it self off. After that it started having Idling problems and I cant seem to find the problem. I changed the plug wires, and the fuel filter it still idle wierd. Its feels like it running rich and it feels like im only running on three cylinders. And it still keeps overheating after I got a coolant flush. So I dont know if thats my thermostat or is that my water pump. The water temp stay at a steady point at the first 30 minutes then it starts overheating. Sometimes it goes down and sometimes it just stays up. If anyone can help please.