What cause the turbo to surge at highway speed? Mine will sometimes fluctuate between 22lbs and 30lbs of boost at 65mph and higher under WOT.

 

Bump! I'm having the same issue with mine. Thought it was the stock lift pump not supplying enough fuel at WOT so i installed a walbro and big line kit. Helped out but its still doing it. I'm starting to wonder if it has something to do with the fuel control actuator (FCA). Can anyone with a little more experience chime in?