LB7: EFI tuned HARD defueling issues

[SkintBack13]

Ok fellas I have no idea about this one...
I have had EFI on my truck for about a year with no issues until now. BUT now on every tune, including stock...truck will only run up to about 2400 rpms and then it defuels. This is a big issue for me seeing how 2 days ago I needed to get to out of town quick to save my brothers house from a wildfire and the damn truck would do 86mph top end. Any more throttle and it would just defuel. I can put my foot to the floor and she won't move. I ran the truck with my autocal plugged in to check everything out cause im not sure how to log and all that but I didn't see anything to be out of the ordinary...
ANY and ALL input very much appreciated.

Stock motor and tranny tuned by ATP

 

[meshanic]

Sounds like you're in limp mode. Tuning doesn't change so if it worked for years it'll still work. Any dtc's?

 

[SkintBack13]

No sir not throw in any DTC's. Never been in limp mode with efi live and I don't think that it is because it still has every gear. Previously with my banks tuner I limped it but it lost Rewind and only had 1st-3rd...I think

 

[duramaxzak]

Fuel filter?

 

[SkintBack13]

GREAT CALL! Didn't even think of that...I'll checker out!

 

[TLyons90]

Def replace your fuel filter and see how she runs after that!

 

[IdahoRob]

Most likely fuel restriction as stated. You can always take a short log of it under those conditions and it will show up what is happening. I'll be happy to review a datalog and see what jumps out.