M94 2000 series 10 cylinder. Boat 2012 Sunseeker with 700hrs. Problem started out of no where. Upon acceleration as soon as she hits 1850rpm the secondary turbos come in and out about 4-6 times then levels out and runs fine. Happens with both engines. Does it with sync on or off... Have had numerous professionals look at them with the computer hooked up. None of them can figure it out. We have done 6 sea trials. Bottom paint is fresh. Props were checked and fine. All filters are new and clean. Full service was done... With the engines on the computer, all parameters are fine according to MTU reps. ZF controls were checked and are working properly. They are the original props that were tested by MTU and Sunseeker during initial sea trials. Sunseeker says these are the props it should run. I have been running the boat for 2 years. Problem started 6 months ago. Nobody can figure out whats going on. Any help would be great. My boss is tired of spending money to get no real answers. It is also beginning to make me look bad..... Please help! Thanks in advance.