Mercedes Benz repair: 1992 Mercedes Benz 300E 2.6 Stalls, mercedes benz 300e, engine wiring harness

Question
My Mercedes Benz 300E, 2.6, 125,000 miles stalls when it reaches operating temperature.  When you try to restart the engine it infrequently fires and when it does it sounds like it is backfiring through the intake manifold.  This problem originally started while the car was residing in Florida and continues now that the car resides in Vermont (the car had to be transported to Vermont).  The engine starts and runs great when cold.  The engine and vehicle have received all service, oil and filters per Mercedes schedule since I purchased it new in 1992.  The engine will not restart until it cools to an ambinent temperature (about 1 hour).

The Mercedes dealer has replaced the air speed controller and the idle valve with not resolve of the problem.  

Answer
Best guess:

MB Engine Wiring Harness Failure
http://www.mercedesshop.com/shopforum/showthread.php?p=927185#post927185



Other possible issues:

1987 300e, Stalls when Hot
http://www.mercedesshop.com/shopforum/showthread.php?p=964810#post964810

300E stalling right after starting, then will start right up again
http://www.mercedesshop.com/shopforum/showthread.php?p=400291#post400291

Finally! Stalls with Tester Hooked Up! But What Does It Mean?
http://www.mercedesshop.com/shopforum/showthread.php?p=452464#post452464

Benzmac, M.B. Doc or Stevebfl, can you help?
http://www.mercedesshop.com/shopforum/showthread.php?p=220667#post220667