At 102k miles my 6.ohno had to be replaced because of a split block(in 3 places)Anyhow its now got roughly 60k on it and is having issues.Its had the same issues for awhile now,but couldnt afford and didnt want to fool with it.
Ill start with starting the truck.Often times when starting it would jump to almost 2 grand when it first fired up.I recently did the blue spring upgrade and that seemed to help.The next time I notice it is when I pull out of the gas station on to a 3 lane road with a 55mph speed limit.If I try to pull out in a hurry Id get run into.When I pull onto the road foot on the floor it hits about 3k and wont gain anymore rpm at a steady foot on the accelerator.It acts liek a standard shift that runs out of rpm and needs to be shifted.If I plant my foot in it,it slams down a gear,and once it gets back to about 2500 it pulls like normal.Sorry its hard to explain but hope you get the idea.It surges like mad while sitting at a traffic light,seems like when the ac on its much worse,dunno if it has to do with the ac being on,or the temp outside.Its basically gutless at lower rpms,and it surges while going down the highway.Best way to explain that is it feels like towing an overloaded trailer on too small of a truck.What really made me notice all this was driving a buddies clone of my truck,his tuns about as good as a 6.0 can.
Its not throwing any codes,I run a scan gauge II if anything that it can read will help me diagnose this thing.To me it doesnt seem mechanical.I obviously need some help,but Im thinking maybe its the FICM,I also thought maybe the turbo was dirty but Im guessing the remans come with a new turbo.

Hopefully I didnt bore you all,but I could really use help as this thing is driving me nuts,appreciate any input

Dan

 

Program some x gauges in your SG2. Some important PIDs are FICM main, ICP, EBP, BARO, MAP, IPR, and Boost.

While your programming, put in the Engine oil temp.

Any mods to the motor? What year?

When you get the values of these PIDs, post them up at idle and high idle

 

What year model? It sounds a lot like a bad ICP connector. You might try disconnecting it and see how it runs?

 

2003 F350 cc dually 4wd auto trans.Other than an air intake coolant filter and cat delete its stock.jswartz,Ive got most of those in there just need to log them.You just reminded me that while rolling down the road the boost seems ridiculously low,for instance at 55mph itll vary from.75 to only 2.Doesnt matter if Im towing 6k lbs or empty.Big Inch thank you for the suggestion,Ill do that as soon as I can,Thanks again guys.

 

You posted the paragraph below in January. Was this a different truck/engine?

 

Same truck/engine I cant help but think that tuner is what did the orig engine in,I could be wrong,but just have that gut feeling.The truck had 45k on it when I got it in '04.Never did get that panel replaced.