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A problem like this could be anything, and unless it has started by the time you read this, you have to narrow it down to either a fuel or ignition related problem. 850's are know for failing fuel senders but usually they give intermittant warnings prior to complete failure. You may also be experiencing the famous "lawn mower" syndrome and have simply flooded the engine. With regards to the LED that "glows at 1/4 brightness", mine has done that since day one. I have been told by Volvo technicians that they see that on occasion. It's just an anomoly. Ignore it and continue reading codes as usual.
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