I have a 2001 S40 and recently my car has studdered randomly when idling and under initial acceleration, up to about 2,000 RPMs. I recently purchased a new MAP sensor (on the tube right above the radiator)and replaced as I've read this is the solution, but the car still has the same problem.

Thoughts? Did I replace the wrong thing?

 

Update: I discovered there are 2 MAP sensors in the car and I replaced the wrong one. I changed the one on-top of the rad, however it was the one on the manifold, under the fuel rail that needed changing. Same sensor (boost sensor 2 accoring to VADIS).

Works like a charm now.