My 1984 mustang will stall while I'm driving down the road. It does not matter if it is hot or cold out. Usually after I drive over 15-20 miles. Does not always happen. Used to do it mostly when I was driving uphill, but now it does it just any time. I let it sit on the side of the road a few minutes and it will start back up. But it will go for a little way then do it again. Its a carbureted 5.0. I have changed the fuel pump, the fuel filter. The fuel lines are not against anything hot to cause vapor lock.