violent jerking and power loss

[Olimat]

the power loss occurs in high rpm range

[Tractor Dave]

Run a boost leak test again. If thats ok, check the maf pins. Also check your fuel pump is good.

[Tractor Dave]

And the fuel filter. Any poor fuel delivery will cause boost cut as the mixture goes too weak.

[Olimat]

true, the car has been sitting for the last 10 years

[Olimat]

the fuel filter is under the car, right?

[Tractor Dave]

Yes

[LHD_Kid]

My money is still on a boost leak - you need to do a proper pressure check (visual inspection of hoses is not enough)...
disconnect and connect the MAF a few times in rapid succession and remove the "moteur" fuses from the fusebox for a couple of minutes...

[Olimat]

, i replaced every pressure tube, im gonna try the maf plug and unplug, im also going to try a boost leak test, but the car run great before the rupture of the pcv valve hose

[LHD_Kid]

They can leak around the injectors, from the exhaust manifold gasket as well as the multitude of hoses... as I said, visual check is no good - replaced or not, might still leak.
What hose clamps did you use? For example, mikalor type are known to cause leaks as they don't do the job properly...

[Olimat]

ok thanks, the hose clamps i used are equal to the original but inox and of course new

[Olimat]

this type

[Rikki Kitto]

You should be able to find a silicone replacement.
It's worth replacing all the hoses that see boost pressure including all the original cotton braided rubber vacuum hoses.
The only one I like to keep OEM is the throttle body hose, the silicone ones don’t fit so well and tend to pop off.

Do the ANN throttle body upgrade from the S4 S6

[Olimat]

because it has different PCV hoses?

[LHD_Kid]

because it has different PCV hoses?

No, the AAN throttle body is longer where the hose fits on. Less likely for the hose to pop off

[dr.strangelove]

Your symptoms sound similar to mine and based on the errors im getting with my maxx ecu, it could be related to your trigger and or cam sensor signals.