boost leak / drivability

[SideSwipe]

If a diesel (early 99 7.3) had a bad boost leak(s), besides it being down on power, what would other symptoms be? Like how would it drive?

I havent dug deep enough but i didnt have very good luck with my boost leak test, unless i was doing it wrong (same way i do my turbo car). I could only get 4-5 psi, and drops as soon as you stop pumping air. so it was hard to pin point.
looks and sounded like a pin hole in upper intercooler pipe from rubbing, and maybe a boot.

But again, my main question is how would it drive and shift if there was a bad leak(s)

[SideSwipe]

anyone know?

[SideSwipe]

did i post this in the wrong section or something?

[junkinjoe]

it would have bad fuel milage,no pulling power,and you wouldn't hear your waste gate.

[Powerstroker7.3Ldiesel]

It would smoke,no power,and bad fuel mileage.

[SideSwipe]

ok thanks.
No power, yes seems low.

Bad fuel milage, i guess, gets about 12 13ish. figured it was because i have to keep it at least 80% throttle just to keep it moving lol

No waste gate sound, i dont know what a 7.3 waste gate sounds like.

smoke, no

I do know my psi when floored, goes to about 18 and drops to about 10 when it shifts and crrrrrrreeps back up to 16-18 as the rpms go up. also shifts funny some times, rpms go up and down in between some gears, and i noticed that the psi goes up and down too when it does that. i dont know if the boost going up and down is causing the shifting problem (rpms going up and down) or if the shifting problem is causing the boost to go up and down.