mgtmse01

What's up Hydra crowd? I'm gonna throw this out there see if anyone may know. When on the throttle, in 5th gear, around 90mph I get this fairly violent engine "bucking" which is the best way i can describe it. It seems to be during high engine load events. i can back off the throttle and it goes away but it is like i am hitting a wall, i can't get full power out of the engine. I attached a photo of the event on the datalog to see if anyone can recognize it. So far, i have changed plugs, plug wires, i use premium fuel of course. fuel filer is new. checked for vacuum leaks and exhaust leaks. i believe the engine is a little overfuled but the o2 sensor and auto tuning is turned on. max boost setting is at 20psi well above the threshold to cause any problems. ran diagnostics...wtf am i missing?? any help would be awesome...