Q: my truck suddenly dropped to the four cylinder mode and is stuck there. Surely this is not normal. Is there any repair or fix?

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While driving slowly with a small load on a gravel road the truck suddenly lost power and died. It finally restarted but only runs on four cylinders now. It will not switch back to eight no matter the speed or load. What do I do?

My car has 230000 miles.
My car has an automatic transmission.

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