That would be P0299 Turbo underboost, which is likely caused by a bad EBP (Exhaust Backpressure) sensor, or badly stuck unison ring on your turbo, which would be consistent with the turbo farting symptom you describe. The first step is to monitor your MAP (Manifold Absolute Pressure) , BARO (Barometric Pressure) and EBP pressures at Key-On/Engine-Off to ensure the are all reading correctly. At Key-On/Engine-Off they should all indicate atmospheric pressure (about 14.3 psi depending on where you are located geographically). Once you've established that they are all reading correctly, you need to monitor how they change/react to acceleration. If MAP and EBP aren't increasing proportionately, you will need to remove/disassemble the turbo to examine the condition of the unison ring, vanes and the turbo center housing itself, to determine the repair necessary to correct your issue.