Thanks Steve.

I will have the potentiometer checked out. I have just doubled checked all the work orders and this piece has not been replaced. It still has the (original?) yellow paint marking the position.

I looked for this part in the parts shop but couldn't find it. Any idea how much it runs should it turn out to be bad?

Also, any theories on the "only after warm start" scenario? Does it behave differently once engine temperature is hot vs. passing through this point from a cold-start?

The mechanic I will be going to is more of a specialist with BMWs. He's been doing nice work on my Audi and also works on Mercedes, but they are not his bread and butter. The dealer has been taking my money thus far for this stalling problem and the problem remains.

Thanks again,
Garth