I have an 06 F-350 XLT with the 6.0. Just changed both fuel filters. Added an injection cleaner to the fuel. Transmission just replaced. Truck runs great until it is under a load. On a level surface it is fine but when you start to go up a hill (not towing) around 60 to 65 MPH the engine starts to chug. Towing it starts chugging around 50 to 52 MPH and only when going up a hill. when you level out it runs fine. Anyone have any suggestions?

 

check out this web site Hot Shot's Secret

 

my 03 had similar problems as yours and i had it scanned and came back as egr problems. i popped it out and cleaned it and it ran great again. im sure my egr valve is on its way out but i just need for it to work till i can do my delete kit

 

My egr was caked when I bought it a year ago cleaned it but maybe time to check it again.

 

That notorious EGR ruined my day a few times......it literally felt like the motor was running on one cylinder

 

a year ago is a long time. check that first.
have you check for any codes?

 

changed EGR out. It was not all that bad not like it was a year ago. Took out for a test drive thought I had it licked but it came back. Only this time it is between 65 and 70 without towing and the chug is much worse. Feels like the engine is going to let go. I was just waiting to hear a bang but never did. Guess I will try that hot shot stuff. I do have the edge juice controler maybe I will disconnect that and see what happens. The chug does happen in all modes except race - never use that no need. Open to any other sugestions.

 

I hope you upgraded the tranny when you changed it out. The Edge is hard on a stock tranny.

 

take your edge off. i was towing in friends truck that had edge, got to 60 and truck would stumble and almost quit, like i was towing with a truck with a really bad timing issue.. took it off on the side of the interstate and ran fine ever since, turns out chip went bad. and that was his second new chip that it had happened on.

 

Thanks, I will disconnect the Edge toninght when I get home and see how that works.

 

Well Edge Juice disconnected and no joy stumble is still there. No idea thinking IAC or IAP? Wiring harness shorting out but why only at that speed?

 

sure sounds like an egr related issue.does it smoke at all when it chugs?.

 

Will have to see on way home today. Drove truck into work but I just replaced the EGR with a brand new one two days ago.

 

Firend has a program on his laptop and is going to hook it up to the truck this weekend and check codes etc and see what is says when the truck does it.

 

truck does not smoke when it chugs.