:I have a 1974 Maverick with the 250 1bbl straight 6. When the vehicle is cold it idles well. When the car heats up it acts like it wants to die and it does very often. I have just tuned the vehicle up. I bought it after it had set for 2 years. Everything looks fine. It is getting air, gas and spark. I have no idea what the hell is going on. My guess is a vacuum problem. Anyone with information that can help please reply to this post. I have to run emissions tommarow and I need the answer like right now.