VOLVO S60D5 THE ENGINE CUTS OUT MOMENTARILY WHILE DRIVING

My response to another post, see if it is applicable:

Had the same problem where the idle would go to about 500rpm and 'cough', i.e. move up and down and not be stable. Got so bad that when I was in traffic recently the car stalled every time I came to a stop. Turns out I have a bad oxygen sensor as well as MAP sensor. Expensive parts (about $200 each) though not hard to replace. May want to check those first. MAP sensor I believe controls something with gas combining with oxygen in the engine (too much gas, not enough oxygen to combust). I would press the gas peddle and not get much response. I was flooding the engine because that sensor was bad and that's why it was stalling. All stuff I learned after my very uncomfortable experience recently. I have a 2003 S60.