RepairPal Certified shops can diagnose and repair your 2003 Volvo V40. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
This could indicate a vacuum leak, issue with the throttle body or an engine sensor.
If you don't normally work on your car then use this link to find a good shop near you.
https://repairpal.com/repair-shops
Alex