First disconnect your O2 sensor when the symptoms occur. This is because you only want to deal with one feed back control at a time. Verify that the throttle switch is closed (electrically - the euro car had a different throttle switch arrangement). Be sure of your vacuum control to the distributor retard (it should be off when the motor is warm).

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