Who decided that the fuel presure regulator was the problem that disabled your car? How was that diagnosis arrived at? Perhaps the stall was related to the problem that you have now.

Any parts or tools missing from your last repair job? Has anyone worked on the car lately? One of my tenets on troubleshooting is - What happened just before the problem came to light? You had the plugs out.

If parts are clashing, you should not try a compression test, every tap is doing damage.

Some possibilities are - foreign material in that cylinder, timing belt has jumped, the engine stops because of a problem not in the cylinder, such as a broken cam.

I think that you have to take it apart or look in there with a scope - I'd find a scope. With luck, there might be something in there that you can remove.
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3 8s & 2 7s 725,000 miles total