Hugh RPM, in boost, car bucks hard and wont accelerate

[XxcastxX]

Hey guys I have a 90 tsi that I bought this summer. It was completely stock but had 80k miles.it had been sitting for a year. I've been doing maintenance and all that all summer and it works fine except for one thing, it hits like a wall in boost.


Here's the scenario, the only mods I have are a manual boost controller and a boost gauge, along with most of the emissions extra stuff removed and an open air box.also no balance belt.

I will be driving around town,car is dog slow till about 3k rpm, hits boost,does fine. I can put the pedal down about 5/6ths of the way down. IT holds steady at 10psi. It's set for around 13. If I push down on the pedal that last 1/6th, the car accelerates, then bogs huge. It feels like stalling, like a huge buck, and if I let my foot off of the accelerator a little bit,then it is fine.

Bear in mind,this is the only issue I have with the car. No codes, no nothing. I drove it almost 900 miles this weekend with no issues.
But this spools me hard, what could be wrong?

I checked the plugs and wires, and ran injector cleaner in the tank.

 

[BIRDCLAWTSi]

I cant tell if you're hitting fuel cut or you have a boost leak by your description. I would do a boost leak test first. Does the boost spike past 13psi? Fuel cut feels like hitting a wall, It is violent and scary when it happens. A boost leak on the otherhand, Will feel like bogging and it will take a long time to build boost, And will also give you fuel cut. There is plenty of info on both of these subjects on this site. Do a boost leak test and go from there. If you need help, Ask. Later.

 

[XxcastxX]

This is indeed, violent and scary, and also once the turbo spools boost comes on fine with no hesitation.

 

[dsmdeliveryboy]

Sounds like fuel cut..