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Just a suggestion,
You might try keeping an inductive timing light in the car. When the problem shows up, hook up the light and turn over the engine to see if your ignition is at least attempting to give a spark to the plugs. Of course sometimes even if the plug is fouled (or the gap is bridged) you can get the light to fire because it's current (not spark) triggered. I once had a problem with an ignition coil where, when shutting off the car, and the under hood temp went up, the coil outut was almost non existant. The timing light showed this.
Good luck,
Leon
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