This appears to be a common problem with the S70/V70/C70 and mine has started doing the same. From the threads I have found here and elsewhere it appears to require replacement of the Electronic Throttle Control module.
I've just been in touch with BBA-ReMan in the UK and they are looking for any information anyone has on the symptoms / frequency of occurrence of this problem (it seems from the posts that this is a reasonably common occurence).
Their website is http://www.bba-reman.com and if there are sufficient enquiries from Volvo owners they may consider producing rebuilt units. Whilst this doesn't particularly help me for the moment it is definitely worth calling them if yours fails in case they have started rebuilding these.
In the interim, if you have had a replacement ETS throttle module, can you please post a reply stating car model, year and mileage/year at time of replacement? I can then feed this back to hopefully assist them in determining the viability of gearing up for this work.
Thanks,
Alastair
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