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The most common problem for '99 to '02 Volvos that cause that is indeed an ETM. Volvo now admits that cleaning it is a waste of time. Even IF it helps temporarily, the problem usually returns soon afterwords and is usually an internal electronic problem. A bad MAF sensor might also cause that, as will a vacuum leak which should have been obvious to an experienced tech.
You can always request that either another tech diagnose your problem at that dealership or go to another dealer but you will pay for more diagnostic labor elsewhere.
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