I believe that this is a good info forum..

Possibly the fact that you asked 3 separate questions on 1 post kept people from answering.

To start with, when you say a rough idle..how long has the car been sitting before you purchased it? Possibly the fuel has caused damage to the injection system? Has there been any tune-up work done recently?

You can always send me a PM on a specific problem..1 at a time.

The sunroof problem is common on the 1986-87 W126 cars, Mb issued a bulletin on that problem 20 years ago. The lifting angles break & cause havoc..repairs can approach $1k

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