Hi Jerry,
I feel for you. With what was done to it no wonder the turbo is fried. First thing first, please revert the fuel pump modification that was done so fueling is back to stock. Have a look at all the boost/vacuum lines in the engine bay to find any bleed that was installed by the previous owner and make sure to get rid of that too.
You know, $465 for a turbo is quite cheap. Unless it's a cheapish Chinese-made knockoff, buy it. You should get on a Trooper forums and ask if anyone has a spare lying around.
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