Dies while driving

What is your question?

sometimes idles very low. It has cut out at highway speeds and kicked back in by switching tank switch. 20MPG in town and dies, will not restart. Wait 5 minutes and starts up and runs. Backed out of garage, 10 minutes later it would not start to pull back in, waited 6 days and started right up. Temp outside under 70. Can drive 200 miles without a problem stop and go or highway,then 3 dies in 15 miles.