I also have only seen 8v 102 motors in 123 bodies.

One thing I have seen on european systems is a decel valve that dumps air into the intake on deceleration. If this valve sticks it will stall the motor in a heartbeat. The valve is a plastic ball about the size of an egg with two air tubes about 16mm inner diameter and one vacuum line that goes to a switchover valve.

Easy diagnosis is to disconnect the vacum line. The gulp valve then never works = verifying an intermittant.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician