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What is a tune up on a Regal other than new plugs?
If your turbo is also leaking internal and in the intake track that will give you a knock problem also.
If the vacuum increases, then the fuel pressure drops....so you need to watch the vacuum to see if this was the case.If the vacuum decreases, or goes into boost, then the pressure should rise. If the fuel pump is weak and it cannot keep up with the one per one as it should, pressure will drop
The timing in the stock chip is too high for today's gas. You need something newer. Heck I might even have a Thrasher chip for stock injectors that you could have for a song if cost is the issue.
You need to set it with the line off. Pull off line and set to 42lbs, then try to test again.
Stock chip? Why?