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If it's happening while driving and no brakes applied it's probably a belt causing the noise. There's a product available in most local auto shops that you can use to lubricate the belt. I think the actual name is "stop squeak" but I'm not positive. If it's squeaking while breaking you may need new breaks or your breaks may be too tight. Another product exists for breaking squeals available in your local auto shop
sounds like your timing may be off, or have a crank shaft postion sensor failing, when it cuts are you losing spark completely? do you have a fuel pressue gauge? whats the pressure? also you could try running it with the map sensor unplugged and see if the condition improves
I would look into either the EGR system, or the idle air control valve. It is usually a clue at which point a car begins to act up, since after about ten minutes the car is usually warmed up, it would lead me to look towards the hot idle circuit of the idle air control valve. I hope this info helps.
Has he checked the turbo, pressure? How is your air filter? could be a short to the coil for the pump Try running a couple of tanks of amsol additives cleaner, may just be carbon deposits forming on your injectors.