Check to see if vent tube on fuel tank is clog. Have had this problem before. It will run good for a while then will start to lug down. Hope this helps. TlB
Check the turbo wastegate actuator. connect an air supply to the hose that goes to the diagphragm use a pressure regulator set at 27 psi if you can hear air leaking out replace. we have done a couple, they just dont go if shot