Date registered: Jun 2011
Mentioned: 0 Post(s)
Quoted: 83 Post(s)
Welcome. We'd love to see some pictures when you get a chance.
Do some forum searches in the 126 section. The rough idle particularly is a very common problem with the 116 and 117 engines, and there are several potential fixes, from plugs, and or wires, to the idle control valve or module, fuel distributor, vacuum leak, etc etc. Vacuum leak is probably the most common cause. For the sunroof, I'd recommend getting some white lithium paste, or the actual MB sunroof lube(gleitpaste) and again, do a search for how to lubricate it.(google may be better, the site search is notoriously fallible.) The lube can be gotten at the dealer, mercedessource.com, or peachparts,com. If that doesn't work, you may want to have it looked at by a pro if you're not pretty car savvy, it can get a little complicated from there. But again, searching will definitely help if you plan on doing any projects yourself.
My last piece of advice would be to just browse through past threads in the 126 section. You will definitely learn a lot of valuable information that will come in handy.