Just as a troubleshooting approach, I would put an ignition timing light on any of the spark plug wires and watch its behavior as the engine stalls. If it's evident that the spark is vanishing just before the engine RPM drop, then check all the wiring and switches again. If spark is still present after the RPM start to drop, it's >probably< not an ignition problem.
You said the wiring had been "looked at," but that won't necessarily turn up a problem. Every now and then a wire will corrode and/or break inside the insulation and out of sight. The slightest bit of flexing (like a tractor trying to move) can allow the wire to shift position ever so slightly -- and fail. Then, at rest, the wire can return to its previous position and conduct just barely well enough to fool you. The same thing can happen inside a switch due to wear, dirt, moisture, oil, etc.
Anyway, if the spark is vanishing, I would follow janicholson's recommendation regarding the test light (this is different than a timing light), and temporarily bypass any suspect wires and switches using known good parts just to make sure there are no hidden problems.
It's a long shot, granted, but this situation disabled my daughter's truck this year and it was a bugger to figure out!
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