P0402 and p0299

JE_6.4

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Got a 2011 with 111k miles. Throwing both p0402 EG.R excessive flow and p0299 boost codes.
It's a friends that I haven't looked at yet. Truck is completely stock.
For just the p0402 I thought maf first and with p0299 I was going to go to ebp sensor.
Is the ebp causing excessive soot and in turn caused the EG.r to stick open?
Where would you start?
 

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