Can you provide any more info about mods you have done to the truck? I first glance, i would check some basic items .. Fuel Pressure dropping or fluxuating would be my first guess, when was the last time you changed fuel filters? If you provide additional details about truck that will help in diag. Also does the truck run fine when you drive it easy, Light Throttle normal cruising?

 

Another item is check is if the VGT (turbo vanes) are sticking or the actuator is acting up causing them the vanes to open and close erratically under med to hard acceleration.

 

the only ugrades i have have is an afe intake. and it does do it during mild acceleration but not as much. and how would you go about checking the vgt's and actuator

 

How many miles are on the truck.. without taking the turbo off the truck the best way would prob be get yourself AE or equivilant (or maybe just take it to the dealer and have them diagnos it) With a software tool like AE you would be able to run many tests to help you pinpont the issues. Do you get any type of check engine light ?

 

100,000 and no i dont get any check engine lights on. what is an AE?

 

Auto Enginuity it is diag software that allows you to test various part of the engine. it also reads codes etc. Based on the mileage and learning curve (no insult intended) maybe a trip to dealer to diag is best choice. You can always come back here with their results and post them here for next steps.

 

also a quick search on the forum has a couple posts about the same issues..

6.0 Turbo Barking - PowerStrokeNation : Ford Powerstroke Diesel Forum

noise when accelerating - PowerStrokeNation : Ford Powerstroke Diesel Forum

There are many more.. a little time spent searching for your topic will provide you plenty of reading... so far it seems to point to the turbo..