Khalid ws6

Hi guys
How are you all? 😁🍻

I need some help started to get crazy 😆🔫

I'm facing some issue and got stuck need some advice !!

First this is the details I drive a 2001 Trans am ws6 ls1 6speed
Modes
D1 Procharge (10psi) , AFR heads and cam, Bolt tons,
I toke the car to the one of the best tuner in my country, where the problem started in the dyno
😖
Loosing boost from 10 psi going slow to 5 then in high rpm 0 psi.
My tuner said to do a boost leak test, I found the blower it self leaks and 2 injectors and 1 clamp is damged all of this is fixed. And here where it's makes me go crazy 😖🔫
Took it back to the dyno and still losing boost in 4k RPM from 8psi going low 0psi !!
So What do you think guys
Note that Im not sure if the by pass valve is working and I do not know how to check it!
For your advice and thank you.

8388

Belt slipping? Also, your spark plugs are showing a very rich condition, which could be due to too much fuel and not enough boost.

Khalid ws6

Not sure if the belt is stabile in high rpm, my tuner said it might be my spring valve or by pass valve. I will test agen the boost.

And for the spark plug its been changed at the same time.