Suddenly the car begins to run rough in idle, after seconds under this behaviour it turns off.

I change the ignition coils (Duralast), spark plugs (volvo original), fuel pressure sensor (bosh original) and the me mechanic says he change a camshaft sensor and fix the wire to the pig tail camshaft sensor... whatever that means... the truth is he had the car for two weeks and nothing was fix it... and of course I paid for the non-service.

Pump was change a couple years ago and since then the car has been running fantastic, then I would say... is not the pump.

Any ideas? My next step is to bring to the dealer this week... which means a lot of money.

 

has the car been scanned for any check engine codes? running rough can imply a fuel mix issue - which can be caused by a bad sensor (hopefully a code will say which), incorrect mixture (intake air leak, low fuel pressure etc), weak spark (plugs/coils/wiring harness to the coils - typically symptom is a misfire code here) or bad compression (valve/rings/head gasket etc). Without codes, the first step would be to do a visual inspection of vacuum lines/air intake boots/hoses etc. you need a shop with a proper diagnostic plan so going to a dealer may not be such a bad idea since they have the ability to scan the car for all proprietary codes etc.