I had this exact problem with my 2004 XC70 2.5T at 120K miles. The engine "kicked" only when I was driving above 60 mph, and was trying to accelerate.
I replaced the coil-packs and spark plugs, and that solved the problem. In terms of previous maintenance, there was no record of the plugs ever having been replaced.
When they came out, the electrodes were worn down nubs, and the gap was 1.5X the spec. The recommendation is new plugs every 40-50K miles.
As far as needing new coil packs, that was just a guess on my part, but they were original equipment, and should be replaced every 100K miles or so.
There were never any DTCs thrown.
2013 XC70 T6 Flamenco Red (hers)
2015 XC70 T6 Seashell Metallic (his)
past: 13 Volvos going back to '74 242 sedan
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