We have a 1988 760 Turbowagon that stalls after putting it into reverse but only after the throttle has been depressed and released (ie when backing up in a parking lot).I found that I could stall it by repeating this type of throttle action. Does anyone have any ideas of what might be causing this to happen? Thanks.

It's most likely what the previous responses point to, but failing these, you might check the wiring harness connection to the AMM. Oxidized, loose, or dirty terminals can break contact when the harness leg which serves the AMM swings forward a little on shifting into reverse. Happened to me recently after washing the engine. I found a fine but evidently insulating precipitate on both ends of the connection, which I gently toothbrushed with contact cleaner. No more problem.

could be dirty throttle body or worn motor mounts. dirty tb is self explanatory; worn motor mounts could be causing some linkage issues in reverse.

I'd guess it's the throttle body.

I forgot to mention that the car has the AW71 automatic transmission.

I second John.

Mine TW actually did the reverse...it stalled when I put it in drive. I removed the TB and cleaned it with a toothbrush and some carb cleaner. It took about 10 minutes to remove it and about an hour off and on scrubbing out the varnish.

I cleaned the TB with cleaner, there was some varnish/oil around the plate and in & around the very small vacuum holes on the backside. With the TB uncleaned the TPS? electrical switch on the side of the TB would only click when the TB plate was pushed closed with a slight effort. After cleaning the TB the switch would click easier at closing and the car no longer stalls in reverse or forward gear now. My wife told me it stalled in forward gear as well under low throttle. So thanks to everyone for steering me towards cleaning the TB-seems that was the main problem!