When this problem occurs, does it happen right away or only after you've driven a few miles?
If you have to drive it a little ways before it acts up, suspect a plugged pickup screen in the gas tank. That's not related to how full the tank is, but having more fuel to wash around can delay when that screen collapses. Often it will relax and let fuel through again after sitting for a few minutes with the engine off. The problem is aggravated when the largest volume of fuel must be pumped, ... Which is during coasting. Once you're up to speed, the engine will run well at highway speed until you start to coast again.
If your engine has the fuel pressure regulator on the engine like my '88 Grand Caravan does, disconnect the vacuum hose from it and plug it. You might see black smoke from the tail pipe, but if the engine runs better, that's a clue to check the screen.
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Wednesday, January 4th, 2012 AT 4:48 AM