OK, I'd say icing is out of the picture. The only cars I ever saw ice up at normal temperatures were early Corvairs. We've established that it happens after the engine warms up, but I'm a little confused there. When you first posted, you said, "'she starts acting like it's running on 5 cylinders. then dies..." In your last post you said, " i should only be so lucky that ' it sputters ',.. nope mine just flat drops off. ..as in " that's, that's all folks "" If it does start running weak just before it dies, there's lots of things that could cause that. Have you changed the fuel filter? I had a car that would die when cruising on freeways. Turned out to be fine particals in the fuel tank that would clog the filter. Let it sit for a bit and enough would settle off the filter to allow gas to flow again. Drove me crazy for a while. thesals suggestion of a short at operating temperature is a possibility. When it dies, check one of your spark plug wires for a nice fat spark. Without getting into exotic problems, engines usally stop running because there's no spark or there's no fuel. Figure out which of these it is and go from there. Long distance diagnosis is hard without all the facts.

Begin with spark and if it's there, check to see that the carbs getting fuel.

Art