A total shot in the dark here....

It sounds like the car's getting confused when the FI goes into closed loop operation. Disconnect your O2 sensors and see if it stays running.

__________________
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles