I was thinking something along the lines of throttle sensor, or computer brain f**t. Last fill up at large truck stop, 100 miles earlier. Towing little 2,000 lb popup trailer, flat land, ~125' elevation, outside temp about 84 degrees, had stopped for ~10 minutes for a bite to eat, got back on the freeway, mile down the road engine drops to idle, no responce from throttle, coasted to stop, turned off engine for about one minute, restarted - no throttle, shut off again, let sit for about 2-3 minutes, restarted - everything back to normal. Full power-running goood. Ran like it's supposed to for the next 200 miles home with out a hiccup.