when you put your foot down, it's negative pressure initialy untill your revs get up a bit and the turbo spools.
mine does read 0 at idle as above so that may be why.
If it is a vac leak, in theory your getting air in which hasnt passed the MAF so fuel mix will be a bit lean. how much leaner than normal though and if it's enough to cause damage, I havent a clue.
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