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Bad coolant temp sensor. The ECU is being told the car hasn't warmed up sufficiently and is calling for an overly rich mixture.
That and / or a thermostat stuck open not letting the engine warm up properly.
I'll email you this response as well. Have it fixed asap as you'll kill your catalytic converter driving like this and after you have it fixed change your spark plugs.
Check this out at Bay13
http://www.volvospeed.com/Repair/thermect.htm
Good luck,
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Erwin in Memphis, '88 745t 190,000 miles, '95 855t 92,000 miles
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