Wanted to close out this thread by reporting how the issue was resolved.
After suffering through the problem without being able to/having the time to sort it out myself I brought the car to a local independent shop that fiddled with it over the course of a month-plus without being able to figure the problem out. Finally gave up on them and drove it the 20 miles to the nearest dealer that I trust/have had good experience with in the past(Merrimack Street Volvo, Manchester NH).
They had the car for a day and diagnosed the problem as a bad fuel pressure regulator. They replaced the FPR, cleaned the throttle body as suggested here, and the problem is solved. Total cost was $238.05
In retrospect I wish I'd gone to the dealer to start off with.
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