Boost leak when cold outside and climbing hills.

Tighten the clamps on the boots on the air to air.

 

Your symptoms don't sounds like a boost leak to me. Wouldn't just loose power randomly for a split second

 

Yes , would t be that simple would it?

 

It should be a constant leak then. It really sounds like the EGR valve is getting forced open, and that noise you're hearing is turbo bark from air rushing back into the turbo after lack of drive pressure under load. Which engine do you have, and what year?

 

Might also check out Rawze.com too, if you haven't.

 

Smoke.

Once you buy a smoke machine you will throw the pressure test adapters in the garbage. Just hook it up and sit back and watch.

Plus it finds the smallest of leaks.

Theres tons on the market. Most commonly used in automotive evap system testing.