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I'm sorry to say you are probably the victim of the infamous "throttle body" defect. You probably have 45,000+ miles. If you live in Calif. or Mass, the defect is covered by a Volvo 7yr/70,000 mile extended warranty. If not, read on:
The problem you are describing is common on '99 and newer Volvos. These use an electronic engine control system. When the on-board computer detects residue build-up in the throttle body (the device that feeds air into the engine), the computer shuts off the engine. Little or no warning. Can usually restart engine. Can't run over 30+ mph. without engine shutting off again.
Our friends at Volvo have made this problem repairable only at a Volvo dealer or the rare independent that has paid the necessary fees to Volvo. The solution is to replace the throttle body. Cost $950-1,200. Just getting the new part won't solve the problem because the on-board computer has to be re-programmed. I have heard that Volvo has issued a Technical Service Bulletin telling dealers how to clean the throttle body. I haven't seen this document so I can't vouch that it actually exists.
Hopefully you are somewhate close to a Volvo dealer. If not, you will have a long tow from wherever your car broke down back to the dealer. Sorry.
It is my understanding the the problem will re-occur on the new throttle body that is installed. Residue caused by air flowing through the throttle body. Probably about 50,000 miles down the road. No current solution to the defect.
Sorry for the bad news.
Edmnds17
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