I apologize if this has been asked and answered before but Ive read thru many of the 6.0 threads and cannot find an answer.
Anyway,,2006 F250 has been deleted but no other mods .it starts good, no smoke of any type and will idle smooth all day.
On acceleration it has a (lite miss) more of a stumble or tremble.At highway speed it runs smooth until you start up a grade or try to speed up
and the stumble will return .once on level ground it will smooth out.

I have no check engine light and have checked for codes and nothing showing up

 

Might be time to check the fuel pressure.
You won't get any codes for low fuel pressure.
Has this truck had the blue spring kit installed in the upper fuel housing?

 

Truck belonged to a friend that bought it several years ago .
only history we have on truck is egr delete and he used motorcraft oil and filters on it .

 

I would see about checking the FP then.....at the very least, get the blue spring kit and install it for peace of mind.
Don't get a cheap knock off.

 

Not wanting to waste some good advice,I ordered it this morning.

 

It would be a real good thing to get a thread adapter for the upper fuel bowl so you can put a pressure gauge on the fuel system for testing the fuel pressure. Blue spring is a great idea regardless. May be able to rent a gauge at a parts house or you can buy a hose and gauge long enough to get it to windshield.
Then take truck for a drive while watching fuel pressure.

FYI low fuel pressure is a injector killer.. Happens fast too BTW.

 

Okay , Have added the blue spring kit and also bought an elm327 and torque pro version
Currently have my screen setup and was wondering what values I'm looking for and what else I need to mointor.
cant remember the user name but I copied someone's setup I found on YouTube