1991 BMW 735i Transmission issue

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I have an issue with the transmission. Engine runs fine but as soon as I put into gear car jumps and engine stalls. What could be wrong with it?

You can’t help out with history on the car or how quickly the problem cropped up? did the problem start after someone was monkeying about under the hood? It is quite a compliment that you think CarTalk could give anything but a WAG based upon the info you supplied but that is all you would get.