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In general the possible causes could be: - Boost pressure sensor harness is open or shorted - Boost pressure sensor circuit poor electrical connection - Faulty boost pressure sensor - Faulty Turbo/Super Charger - Engine over temperature. - Ignition misfire exceeds the calibrated threshold. - Faulty Knock sensor (KS)
I would doubt its the turbo as you said it seems to be working just fine (unless the wastegate is stuck open/wastegate seal is cracked). Also if the ignition misfire exceeds the claibrated threshold then I would think you'd hear that in the engine running normally. I would say locate the sensor and replace it?
That sounds like turbo overboost, ECU cutting the boost off. when you try and boost again feels like your hitting a brickwall, or when it happends feels like your hitting a brick wall...turning the car off resolves this.
Reset your ecu, disconnect the battery for 30seconds - 1minute.
Your problem with the APC system. Any perceived fault and you only get base boost. The most likely fault is the boost pressure sensor located under the dash on the left-hand side. when it is bad you often hear the APC solenoid valve clicking at idle.