This sounds like an intermittent wiring problem. the wires to one of the spark plugs, coils, or fuel injectors may be faulty or damaged. Mice love to chew on wires and you did mention that they found some small animal debris or maybe nesting materials. This will have to be tediously checked out with a multimeter. the good news is, once the damaged wire is found, it can be inexpensively repaired.
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Do you know what they did as far as working on it?
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