neeed help

MSP2003.7

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Mazdaspeed Protege 2003.5
just got my msp 2003.5 and i'm in love but unfortunately the previous owner road from outta state here with a shot caliper and no break pad, so after some break work, and a new 02 sensor the car is in good shape, BUT the idiot manually dropped the cars boost to 3psi, i am very new to mazdas a do not know how to manually up the boost, I know that I have to loosen a nut on the wastegate towards the wastegate in order to raise boost and i do have a boost gauge. can anyone help me? really don't want to mess it up
 
Are you sure that he manually dropped the boost through the wastegate actuator? Are there any signs of new vacuum lines on your car? Are there any aftermarket parts on your car?
 
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