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Could you run another fuel pressure test and do the following:
1) with the engine running, pull and plug the vacuum line from the fuel pressure regulator. The fuel pressure should rise immediately.
2) Do a snap throttle test with the the vacuum line attached to the fuel regulator. Fuel pressure should rise instantly as the vacuum drops.
I think you should also check your vacuum from the fuel pressure regulator line, then from a source close to the manifold. I'in beginning to suspect an engine vacuum problem.
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