You might try the search feature as many times this subject has been discussed. Try looking under "air flow sensor" or stalling when coasting. Many times the air flow sensor is the problem & since it's somewhat $$$$ technicians will hesitate on replacement.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V