In a nut shell:
possible Boost leak- leaking somewhere between turbo & throttle body or vacuum pipe popped off.
Someone played with your boost controller?
Turbo dying.
Blocked Cat. or header leak.
potato in tailpipe.

I would check all of the boost control vac lines first, .9-1.0 indicates it's only making roughly wastegate pressure. look for a split line somewhere.

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