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I do something similar but only after some Chinese Water Torture Thats a post I made on a Miata message board, works just as good on a Volvo 
I now run this procedure on all my cars at least once a year. Makes a difference I can feel every time.
Recently I changed out my 960's spark plugs from the original style single electrode Volvo brand plugs to the new triple electrode plugs, Volvo part number# 8642661, fits 91- all 960/S90/V90/S80. While the original plugs showed no visible wear and were quite clean, the new plugs a significant improvement in fuel economy, however they made no detectable difference in power. At 30$ for the set they weren't cheap but it looks like they will pay for themselves shortly.
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'92 240 @45k & '96 960 @41k
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