This is pointing to a FD problem. I would flow test the injectors and check the FD isn't leaking at the plunger after doing a smoke test.

"no matter where I set the SP, I lose fuel at the same RPMs every time." Can you better explain this statement?

Are you running rich or lean? If you have a large air leak you won't get the car to idle and it will be very hard to start. If this condition exists, you can increase the mixture and the car will start and idle high. But then when you start leaning out the mixture to bring down the idle it will stall.

Did you ever do a smoke test? There is no guessing or short cuts with this test.

Dave K

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1993 2.6 Sportline Automatic
1992 2.3 Canadian delivery