Ford Thunderbird SC Questions

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Car will run and then shut down
I have an used as unit that I wish to %test and bench bleed
On start up car idle's at 500 RPMs has miss fire. On acceleration has no power I have to floor it to get up to speed. And trans shifting I'll regular
I spoke to my stepfather who is a master mechanic and been one for 40 years...
He is the one that has done 99% of the work on this. But unable to figure out the problem.
Crate Motor 40k
Rebuilt S/C 10k
All new Main Fuses/Regular fuses
New Fuse Boxes
New Computer
New relays, Sensors, Sending units, Etc.
As he tried to fix the problem, he would replace everything.
New Fuel Pump replaced inside the Fuel Tank.

Car starts and will run great up until it hits running temp...
Then begins to pop, sputter and acts like the timing has been retarded then dies...
Wait 10-15 mins. - Car starts up again and runs great.
We have had the vehicle to 2 different dealers and left for several days each time.
Spark plugs and wires have all been changed and double checked to make sure snug and no shorts.
Any ideas on this?
Does anyone know of a mechanic that specializes in the
90 T-Bird Super Coupe?
Please don't hesitate to ask further questions... This has really been a pain...

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.
I have had this car at 2 dealers, 3 shops and my step father (With 40 years Automotive experience) have all tried to find the problem but so far been unable to.

The engine is a brand new crate motor from Ford. It has about 25k on it. Everything else has been replaced from the supercharger to the plugs. Etc...

The car has always run perfectly.

The general consensus now is that as the car was in a minor fender bender some years ago where the right front fender had been damaged
and replaced that the wiring harness from the engine to the computer might be damaged?

When I say that everything else has been replaced, I mean everything!

The dealers have all had the vehicle in their possession for days on end, hooked up to their computers, and as of yet been unable to figure out the problem.

We are all at a loss. Any ideas?
Engine oil sending unit shows no pressure when car is running. With key on it shows almost half. All I did was change the spark plugs and went to start it and it started knocking and I noticed no oil pressure.
had just changed the valve cover gasket and replace the throttle with a crown victoria throttle
All four shocks clicking and can feel in trunk bay
gas it wants to stop but wants to go when I let off. also I have to hold both break and gas pedals down for it to stop
problems when I push the gas it wants to stop but when I let off it wants to go can anyone help
I am trying to understand the abs brake system maintenance and operation, so I can be aware of any sign of problems when system is failing.

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