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You have a vacuum leak. If you open the hood and look on top of the engine, there is a lever one the right side (looking at the front of the car) with a red "Stop" decal on it. Push the lever and the engine will stop. Look for any small plastic vacuum tubing that may have come disconnected. If you dont find any, it may be a line inside the car. For temporary relief, you can pull the rubber junction from the vacuum tube that goes through the firewall to the inside of the car and cap it. If the engine now shuts off with the key, that does mean your leak is inside the car (4 door locks and trunk release are all vacuum operated and have tubes going to them).
Go onto scribd.com and register (for free) and type in mercedes 300 e and look at the 2nd one in line. Yours is a 124 body and the owner's manual is labeled 200, 230, 260, 300. On page 86 it has a list of fuses and their location. I hope this helps. I've worked on Mercedes for years and I know how hard it can be to retrieve info on these cars. Let me know if you need anything else.
If you are certain that the fuse is okay, next replace the Multi-Purpose Relay/Combination Relay. This relay controls all three of those devices and is most likely your culprit. I would try the junkyard first and grab two just to be on the safeside. You'll find it under the fuse box cover on the driver's side engine bay.
I'm no expert, just a tinkerer, but I recently had the same problem with a couple of window switches and emergency flasher. I replaced the switches. It was cheap a easy. I got the switches from autohausAZ for about $30 each (local Benz dealer wanted $180, NAPA wanted $50 but were out). Carefully slip a thin but sturdy blade beneath the tab at one end of the switch (about 1/8inch) and then the same with the other--a bent spring clip holds the switch in. Once you've got the clips loose, the switch pulls right out.
Look on Ebay. I bought all kinds of used parts for my Mercedes, (3) 300 TDS and a 300SD. Parts are plentiful for these models and very affordable on Ebay, or perhaps even Craigs List. There is a Mercedes Benz internet forum where members post their sales and needs. I don't know what the import laws are in Malaysia, but I cannot imagine the imposts are high on used auto parts.