[T77911S]

check fuse 18

the FV gets a pulsed signal to it opening and closing it at different rates to change the mixture,.
with 12v on it all the time you held it open. that made it richer. the engine may be able to tolerate richer due to air leaks and perhaps the mixture was set lean to begin with.

with no power the FV is closed making it very lean.

the FV is pretty expensive.
an older FD would require another WUR because the older FD used vacuum control to the WUR to richen the mixture up.
buying a used FD is risky, you don't know what you are getting.

larry at flowcontrol can rebuild the FD and modify it to run without the FV. I know he does this with the 930 fd but not sure about the 911 FD. I would also get the WUR modified so you can adjust the CP to tune the engine better. price would be about the same as going the other route except you would have a rebuilt FD.
negative is larry is very backed up from what I hear and it could take a few months to get it done.

what all is missing from under the seat and how did it run with this stuff missing?