220,000k
City driving no problems unless I floor it above 2200rpm (no smoke, idles fine, starts fine), highway driving if you try to get up to 65 or 2300rpm it stumbles & dies until I let off the pedal & sometimes produces white blue smoke while doing so. The truck doesn't seem to be burning any oil and the coolant seems fine. All the injectors are passing the buzz test and I've checked the UVC. Turbo fan is in good shape no movement and spins fine, no vacuum leaks I can find.
SES lite is not on an no codes are coming up!!!!!
The problem started while using the rear fuel tank one day so I switched to the front tank and the problem went away. Weeks later I now have the same problem out of both front and rear fuel tanks. I'll be driving down the highway at 65 give it some pedal and it starts stumbling and then the truck wont go over 50 mph up a hill or run right above 2000rpm.

New fuel pump
New Map
New CPS

 

Well when was the last time you change your fuel filter. When you switch to your back tank you could of plugged your filter.

 

Changed the filter 2 weeks ago, I've check it for oil spots and its clean.

 

Has your boost changed any. Maybe it is lagging?

 

You were going the right way with boost!! I changed the air filter and cleaned the IAT sensor and problem solved!!!!! I can't belive problems so major could be caused by so little..

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Maybe it's time to modify!!