A friend of mine has a 1987 420 that has a real aversion to idling. Actually it only starts if you have the air cleaner off and you apply a small amount of pressure to the door on the fuel distributor. It seems as though without a finger pressing the door down, the car will just turn over but never start. Once it is running you can keep it running by stepping on the gas or by keeping a finger on the door. It cuts off as soon as you remove the finger or take your foot off of the gas.
Does this sound familiar to anyone?

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1983 500SL

Misc benz parts from 107,201, & 126

1991 Toyota Celica GT convertible

1992 Honda Prelude SI 4WS