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Look for boost leak first.
Also if boost has been raised above what the software is made for using mechanical means or a separate boost controller, you can get the same issue.
Have you tried cleaning the electrical connector to the MAF ?
I have had boost cut twice and it was only this connector that caused it , it's worth trying this first before spending hours testing for boost leaks only to find there is none .
Motronic will:
* Progressively retard ignition and cut boost if knock is detected
* Cut boost if you go over max boost specified in boost chip
* Cut fuel if you go over max load specified in fuel chip.
For example, if you have a leak somewhere, a lot more air will go through the MAF than actually into the engine => AFR goes rich => eventually you hit fuel cut, because Motronic wants to protect you from maxing out your injectors.
But of course if MAF contact is bad or MAF reads wrong, then the same issue will happen, because Motronic will think that more air is going into the engine, than there actually is.
I had this same problem, read all the threads, figured I'd recently had the MAF plug off and cleaned it, must be a bigger issue... after some head scratching and no confidence in the car I cleaned the MAF connector and it hasn't reoccurred since. Definitely worth a try along with a leak test.
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