BMW Repair: 98/523i Stalling while driving, throttle body, air filter

Question
Mechanic cleaned air filter..after that car keeps stopping while am driving.  Took it back he checked his work, says its ok...IS there anything that he could have left out such as a gasket or seal that makes this happen all the time only since he touched it. Car was running fine before.Thanks

Answer
Eva, any check engine light on? There is a large 0-ring in the intake duct that sometimes gets dislodged. Have the rest of the intake ducting checked for leaks all the way down to the throttle body and idle valve. The boots tear when the rubber gets older.
-Evan