I'd say it sounds like it's going into 'limp home' mode, disconnecting the battery clears whatever fault has occurred and off you go again. So we're back to the old story, read the codes, when it's in limp mode, and it may well tell you what's wrong rather than guessing at a string of replacement bits
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David
V70 2.5 10v Torslanda Manual 98 Sreg
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