Lambda won't stop it boosting.
maf will.. but also check your inlet pipe.. if it has a split (check around the turbo jubilee clip in particular) and check all the breather pipes are on.. if the turbo is sucking in air through a split of pipe off it will be like a failed maf..
Also it is fine to clean the newage ones.. use brake or carb cleaner in a spray can.. remove maf and spray etc..
Simon
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