Make sure it's Bosch sparkplug.
Check the spark plug cables and spark plugs themselves. I had the same problem about 3 months ago, and it was a bad plug cable and a bad plug as well.
There's no Volvo 850 2000. What you likely saw was a S70.
I need to no how to remove oil pan
The Volvo 850 has two horns in front of the radiator, lift the hood and their they are.
There's no 2.0L. Volvo 850 engine. Only 2.3L. & 2.4L. ...
The diesel turbo can only fit on a Volvo 850 with a little fabrication.
When you replace the timing belt (every 70,000K).
If you use NGK plugs BPR7ES or BPR7EIX the gap is 0.032. Safe riding!
You can find an air conditioner for a 1994 Volvo 850 on Ebay. The Volvo 850 was designed by Jan Wilsgaard. There have been 1,360,522 units made between the years 1991 and 1997.
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http://www.swedishautoparts.com/850/volvo-850-electrical-parts.html Try this website for a pdf. Hope it helps, Troy