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Also what are your plugs gapped to and how many miles on them?

Normal wear and tear. That appears on every car I have seen. Looks like rust. Are you throwing any codes? Most common issue for bad idle is vacuum leaks, spark plugs, and dirty maf.

Alright everyone I have been battling an issue where my brothers car won't see past 0psi. I boost leak tested the car and after fixing a bunch of leaks including a major leak on the cold pipe I still can't seem to build boost. The car is also leaking from the throttle body seals pretty bad and...