Hey Ben,
Doesn't sound entirely like the same problem, but within the last 6 months I had a very similar problem that might be worth trying. Intermittently while driving down the highway my 93 850 would automatically 'kill' or completely cut fuel from going into the engine. None of its symptoms were common with each instance and I pulled my hair out replacing 600 dollars worth of parts on multiple visits to more than one Volvo authorized mechanic before going to the service department and replacing one of the two fuel relays in the parking lot. 6 minutes and 57 dollars later she's never did it again.(I replaced the one found abutting the fire wall in a simalar compartment to the fuse box.) What is so amazing about this story to me...first that of all of the volvo mechanics I took it to all had heard of similar 850 problems but none had solved them. Second that something that was effectively a simple and common fuel problem was never properly diagnosed or even mentioned and lastly that I was crazy enough to buy parts like a crankshaft sensor in the belief that it might help me out.
I hope that this helps if not you then someone having a similar 850 issue. Good luck in your mystery problem.
Brian F.
Newburyport, MA
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