I have been experiencing a similar problem. 1998 S70 w/ 63500 miles. Problem started when I had battery replaced. Severe and frequent hesitation for about a week after then it basically went away. Had apt w/ dealer and couldn't replicate the problem. Now it seems to occur when I let up on the gas and some idle control takes over. Drive along for miles and let up on the gas slightly as if to just hold your speed and wham - hesitation then recovery. Could it bethe idle air control valve? or the mass airflow sensor or maybe the throttle switch. So far all the advice I have received has been to clean all the connections and hope it goes away - or gets worse so it can be diagnosed. Anybody have experience with an actual fix?
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