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How does it run currently? Just do an inspection of vacuum connectors and fuses, change them if needed, and change all the fluids. Read the service records if you have any to see what work may have already been taken care of. Drive the car around frequently and get to know it. Be advised stuff will break. But don't fix it unless it is broken or you will be entering a world of financial hurt lol
I have a similar car, m103 6 cyl, which belonged to my father and naturally had all the service records. That's great but none of the records show anything of concern had been done, no waterpump, no headgasket, no valve stem seals, no evaporator core. Nothing but fluid changes and other minor things. I got it after it had been sitting in a garage for about five years. Almost perfect shape but guess what I get to do. I get to drive it and find out what's going to break next that's what. My point is there's no way you can tell right now. Just do the cheap maintenance first off, get to know the car, and go from there. Consult the forum as you go.
Performance and fuel economy? Make sure all the consumables are good. Filters, plugs, wires, the usual.
Fuel guage is jumping around because the sending unit is gummed up or something. Get a new one or try cleaning the old one.
Lumbar seat might be a fuse, or the switch, or the motor/mechanism, or all three.
Sunroof might just be stuck through lack of use. Might also be completely broken. If you want this cheap car to stay cheap you should leave it alone until last if it's closed and not leaking. You can investigate further by checking the fusebox again and the switch. See if you can hear a motor running when you hit the switch.
Do a search on these topics individually and you'll get the info you need. Best to have another vehicle or a bicycle while you're sorting this one out. Just kidding I've got two old MBs and neither one has stranded me, but they do seem to need parts every now and then.
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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)
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