Vehicle will start but dies shortly thereafter.

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This vehicle is in excellent condition. It has a crate motor with approx. 30k on it. The various components have all been replaced; alternator, S/C rebuilt, all sensors, fuses, etc. have all been replaced. It starts and runs great, but then simply dies and will not restart. I have had it to 2 separate dealers and left it with them for days. Neither were able to locate the issue. my mother is the 2nd owner of the car. The original owner had been involved in a front end accident which resulted in replacing the passenger side fender and parts. I have been told that based on that, the front wiring harness could possibly have a short in it? This problem has stumped the best mechanics from both CA and WA states. I know long distance makes it very difficult to figure out, but any thoughts? Any T Bird SC mechanics in Puyallup WA area you are aware of? Thank you for your time.