First you don't need a code reader with a 95 - check here for info on checking codes - http://www.volvospeed.com/CheckEngine.htm
Next check for codes. I just went through the ERG thing - only didn't have the time so paid my mechanic - and it makes a big difference in performance and it wouldn't take too much to make me think that if the throttle is dirty enough to clog EGR sensor other systems might be effected too.
Once you have codes hopefully they will point to something easy to fix! I've had some similar problems (not all with 850s) with no warning from battery going dead or a fly somehow got in and clogged a line or just bad gas!
Get the codes and post them! Good Luck!
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