There is an old saying in the biz. It's gotta be fuel or fire unless it's an MB V/8. Then it could be bent valves, but that's another story. Pull the air cleaner and spray a couple of shots of carb cleaner on the air intake plate. If it fires for a short time, you've got a fuel problem. If it doesn't fire check for spark. You may even have a problem in the idle air management circuit. It is also a good idea to follow the advice of 190E dude unless you are sure your gauges were normal.

Good luck,
Peter

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