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Resolder the fuel pump relay AND the "radio suppression" relay (under the hood). My '91 740 stalled -- it was the pump relay. A month later it stalled again -- it was the suppression relay.
I became frustrated and resoldered every relay in sight and the relays in the next car over.
So far neither car has hiccupped again, and that was two years ago.
This will cost you nothing, whereas replacing the crank sensor DOES cost something. So try the free 'n easy stuff first.
Don Foster (near Cape Cod, MA)
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