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Originally Posted by me612
How violent is this jerking? Are you running stock boost? It could be fuel cut, meaning you're running too much boost, not enough fuel, and your car kinda shuts down for a second, then kicking back in, causing a rather violent jerk. To correct that you'll need a better fuel pump.
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A fuel pump will not eliminate fuel cut. Fuel cut happens when the computer sees too much air flow (from the mass air sensor located before the turbo) for the stock fuel system to keep up with so it cuts spark and fuel delivery to the motor. The only way around it (with a bigger turbo running more boost) is with either a computer chip, fuel controller or some sort of engine management. It would be pointless to do this on a stock fuel setup so there for you would want to upgrade your injectors and fuel pump while your at it.
You should not have fuel cut on the stock turbo at this time of the year running 9psi. There for it leads me to believe you have a boost leak but the turbo is still trying to boost the same amount of pressure into the intake. While trying to do that the air is just leaking out so the turbo is pulling in more air to make up for the loss. This is why you are only seeing 9psi.