I just had my oil changed on my '01 V70 T5 (106,000 miles) at a "not-a-Volvo-garage", highly regarded from a good friend. As I drove off and accelerated, I heard a "pop" and the car started sputtering and stalled at the traffic light a block away. I got it off the road, called the garage and, of course, they weren't sure what was up, so I called the dealer I work with. The tech said it sounded like the air line to the filter housing came off, they may have loosened it while checking the air filter. It did. I reconnected the lower line, checked the upper connection above the radiator and tried to restart. It fired, ran rough for a few seconds and settled back to normal operations. I drove back to the garage to let them know what happened. After a couple of minutes idling, it stalled again and would not stay started. I can still feather and it will stay running above 2000 RPM or so, and I do notice a vacuum "sucking" sound. Any other suggestions? Thanks and sorry for the ramble...

 

Sounds like another line might have come off as well.
Find the source of the sucking noise and you will find the problem.