I'm not sure if this relates to your year, but when I had my '83 and did a partial tune-up on it, I put in the bosch platinum plugs. bad idea. I was under the hype that it would be better! it made the car idle like crap and I did not know why. after scratching my head and thinking I screwed something up, I decided to use what worked in the first place and put in the same plugs that were originally on it. so back I went to the auto store to get the regular bosch plugs (the ones in the green/yellow box). I put them in and voila, car started and idled like a happy car. I wasted some bucks on the platinum plugs, which didn't do anything for my car. I haven't tried nkg plugs, but if you go for bosch, don't waste yer money on the fancy stuff, get the $0.99/plug bosch brand. btw, good to change the air filter while you're at it. I noticed volvo-brand filters are no different from fram or purulator filters in price, at least here in california.
btw, you can also get volvo plugs at the dealer. I was pleasantly surprise how affordable they were at the dealer!
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