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The only times my car (83' Turbo, non intercooled) died and wouldn't restart are when:
1. The fuel pump fuse blew; I just replaced it with a different one.
2. I washed off my engine, which in turn ruined my already junk wiring harness. I took it apart and replace the wires.
I have had symptoms similar to yours though, and thought it was the cat. I took it off, cut it open, and to my surprise the previous owner had already gutted it (welds looked a bit suspicious, not the same as factory).
I put it back together, and found the problem was some old and leaky vacuum lines, along with some loose turbo pipe connections, and a loose electrical connection to the fuel pressure regulator. I was having a super rich condition, which caused the car to overdose in fuel, and have terrible power under boost, and terrible gas mileage, and lots of black smoke. The car ran fine with no boost at lower RPMs. Replicating boost related problems is next to impossible while you look over the engine, unless you have a dyno to run it on.
Your timing belt may have skipped a tooth or two, it happened on my mom's 81' DL when I warmed it up one morning. It would not run at all (no compression, cranked over very easily.)
You could have a problem with the cat; you can unhook it at the turbo and try that (very loud, not the best plan to drive it this way). It sounds like a fuel problem, if the car struggles then stops, but I wouldn't be sure. You might just have some leaky connections and loose electrical connections that finally made it to the point of not running.
Good luck, and hopefully you can get some good tips from people on the board.
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