[caccobra]

Check for spark at plugs after it dies. If no spark, try replacing the coil to distributor spark wire. Sounds like something may be breaking down/expanding from heat after it warms up. If that fixes it, replace all the spark plug wires, not just the coil wire with a good quality set of wires along with fresh spark plugs. Just a thought. Hope you find the answer. Things like this can aggravating, but in the end, it is usually something simple.