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[imsolidstate]

Try not to use penetrating fluid as it's bad for o-rings and sensors/actuators and won't likely get past the o-ring to help you anyway. Use some lightweight oil of you want to help it out. You just have to pry it out, the heat from the EGR makes the o-ring stick pretty good.
Also agree with bismic: Stuck turbo vanes (if they stick closed) will cause too much boost pressure and low power due to the reduction in exhaust flow. And if you only had twenty PSI before, than you may have been sticking open too. twenty is a little low.