DD15 , fuel/air problem , not constant / need help

12 Cascadia w/dd15 - 540k miles

Problem: looks like its not getting enough fuel mostly at low rpms (500-1100). You would put 100% throttle and ebgine sputters like it wants to die but it doesnt die duribg idle or rolling down the road in neutral. Also noticed same symptoms at highway speeds. Sometimes cuts out for few seconds and then ot gets tge power back.

Only codes I have are for Delta P (411spn) but i have been dealing with that for coyple of weeks so I dont think its a culprit.

It seems as its fuel/air related under a load but it cuts in and out but then again it doesnt die in idle which points me to maybe somethibg with fuel pressure ?

Oil and filters replaced with OEM at Speedco 12k miles ago.

 

I mean this is first time this happened. Im trying to figure out why my delta P is throwing codes. It was a new sensor 2 months ago but when I take it off tgere is some soot amount on there. When I clean it , drive , restart it seems OK but then it goes back. What could be a cause of that ? Also what is a main purpose of the DeltaP? I do have a small coolant leak (notjing major , just some residue) on EGR cooler but the power is there so the actuator works fone.

 

Delta P EGR pipe clogged ?

 

I got the truck with 433k , current is 540k so i doubt it was replaced. As far as coolant I have a leak from Reservoir because i think upper plastic nozzle is cracked( small hose over it) how do I notice surge in the tank ?

What do you think about EGR throtlle sensor ? But then again there would be a code for it.

 

What you mean by that ? Sorry