[W126 Coupe] 1982 380SEC various issues

[Tad Heckaman]

I just purchased a 1982 380SEC, and it runs great. There are a few little
issues that I'd like to get fix.

The first thing is the locks. I know they are vacuum based, but other than
that I dont know much. Basically what happens is that when I lock the
drivers door, either with the key or the lock itself, I hear the pump run,
and all they all lock, but then the passenger/trunk/fuel unlock, and then
they all lock. It never actually stops doing that (it did it for about 10
time before I decided enough was enough and pulled the drivers side lock
back up to stop the endless lock/unlock cycle). Now this car did have a dead
battery for a while, so perhaps some sensor needs to be reset? I am not
sure.

The car idles low, and lags roughly for a second before the car accelerates.
While idling, it also surges, almost like its idling so low than it revs
itself to keep it from stalling. The previous owner said that the injectors
were dirty from sitting for so long (probably sat for a year or 2, then he
drove it everyday to work for a few months and then parked it again). He
took it to our local MB dealership and also to a regular car shop and they
said that it just needs to be run, with some injector cleaner in it. They
recommended that if its 'working' then dont touch the injection system. Is
that all that it really needs, or should I take it in myself and have it
checked? Is there anything I can check myself?

A gas gauge does not work, where should I look first to fix that (makes me
worry that I will run out of gas at some point)
The radio/antenna does not work (I really want to replace the radio with
something more modern, and if I want to upgrade in the future, having a
working antenna would be nice)
The sunroof sometimes works (prev owner stated that alot of the electrical
problems are just caused by poor contacts on the switches, and opening the
dash and cleaning up the contacts on the switches would help) (hah)

Odometer does not work, title already states that its 'not actual', but can
I get that fixed?

Since I have never had a MB before, this will be a great way for me to get
familiar with how these cars are put together. I just replaced a few lights
and the sealed beams (cant wait for euro lights later on, what a PAIN to
replace those sealed beams), so now I can get it registered and on the road.

Thanks for any replies!
-- 
Tad Heckaman
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