Hi jtl5729. Welcome to the forum. This is going to require a live human being to do the troubleshooting, but I can provide a suggestion based on my previous experience with my '88 Grand Caravan. The engine ran fine that faster I drove, and would die as soon as I let off the gas. It only happened on the two hottest days of summer, then was fine until six months later. Turned out to be a plugged pickup screen inside the tank.
This could happen to any vehicle with a fuel pressure regulator with a vacuum hose attached to it. Two forces act on a molecule of fuel about to squirt through an injector. They are manifold vacuum and fuel pressure. During coasting, vacuum goes way up so the pressure regulator drops fuel pressure so the total of the two forces remains constant. That prevents an overly-rich condition during coasting. As I figured out later, during coasting, since pressure drops, it is much easier for the fuel to go through the regulator and back to the tank. (This is called a "return" system). Easier fuel flow through the regulator means the pump has to move a larger volume of fuel. THAT'S when the partially plugged screen restricts the flow so pressure drops too much. After sitting for less than a minute with the engine stalled, enough junk floated away from the screen that the engine could be restarted.
Now that the problem is understood, there are two things you can try to see if this is your problem too. Remove the vacuum hose from the regulator, (if it has one), and plug it, then see if the problem is still there. You might see black smoke from the exhaust from it running too rich but it should run better. You can also install a fuel pressure gauge and hook it under a wiper arm so you can watch it while driving. Watch for the pressure dropping while you're waiting for that stop light.
Thursday, October 21st, 2010 AT 11:55 PM