U R going to have to provide a lot more info..........
U have any tools to data log, check fuel psi, etc, with?
Scanmaster, fuel psi gauge, etc, are all necessary if you want others to assist with the t/s.....
Mine did that when I first bought it. The throttle position sensor was way out of wack and the turbo actuator was bad. Replaced the actuator and set the TPS correctly with a scanmaster, then wheeeeeeee! I did the whole "spring cleaning" which included the fuel filter. One of those things was the culprit.
I chased a problem like this too. It ended up being MAF. I now have spares of parts that weren't needed though... The scanmaster is what told the tale though...