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I suspect your car has an IAC and you should clean that out with throttle body cleaner and give it a good spray with WD-40 before putting it back in.
Probably a water treatment and Seafoam and "Italian Tune-up" would be worth-while.
The intake system should be smoke tested to look for leaks. You can either build your own smoke machine and DIY it or get it done at a shop.
You could follow the procedure (posted twice on this forum recently) for test the O2 sensors as well:
http://www.brickboard.com/AWD/volvo/1456955/850/code_436new_o2_sensor.html
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1998 V70 AWD->FWD Turbo 200k+
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