Volvo v40 stalling when idling

If the car shakes and stalls at lights stop signs etc. I would check the egr ( exhaust recirculator valve) first this valve should open when in driving mode and close immediately when engine comes back to idle. to check this find the valve on the intake manifold ( looks like a mushroom) remove vaccuum line and plug hose drive the car and see if it fixes the problem. If it does get one from local parts store. Most brands such as standard are universal and come with baffles that must be installed. do not leave the valve disconnected the engine will "ping" when driving forcing you to buy higher octane gas. It is also illegal to remove this unit for emission reasons.