I had a hole in one of my vacuum lines going from the turbo to the wastegate or something and it did what you're saying, but it also was boosting insanely way too high at the same token, but vacuum could play a part definitely want to fix all those lines check the intake and intercooler lines for openings. There was recently another guy throwing a code 51 and he needed to replace his TPS switch... oh nm you got that fixed.
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