Volvo part 1275602 is what you want. Both coil packs are identical. They are not unique to a specific year but I don't think they were widely used.
This video should help if only to familiarize yourself with the location of the coils.
https://www.youtube.com/watch?v=2dWCv9aqeEw
The car in the video is a few years older than yours but it has the same ignition system.
The biggest problem with this vid is that the guy seems to be using a Go Pro or the like on a head band, which is great if you're jumping off a cliff for the ten thousandth You Tube BASE jumping video, but not so much for car repair. He frequently refers to items just outside of the shot. So much for production values.
However, it's good enough to locate and replace the defective coil pack if you do not already know where it is.
But I would second Bill's suggestion to check the connections and I would go a bit further and say pull the plugs to see if any of the electrodes are getting cruddy.
Are you able to tell which coil pack seems to be the problem? You might just want to replace them both if they are of the same age...like maybe the original ones.
FCP has them for $81.99 each (Genuine Volvo).
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'79 242, '84 DL 2 door, '80 DL 2 door, '89 DL Wagon, '15 XC70 T6 AWD
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