LBZ: problem?

[stormy]

I have an 07 Duramax with a ppe tuner, set on level one. The truck runs great, but when I pull a long grade with a fair amount of wait the truck will fall on its face, sometimes predetonating, or just flat out over-fuel blowing black smoke everywhere. Once I get out of it for a while it will run fine again. I am usually at 1100 to 1200 egt, and 210 to 220 F also no codes are thrown. Any feedback would be apreciated.

 

[draftee]

How are your filters?

 

[JMDuramaxLB7]

X2

 

[stormy]

Both fuel and air filter have been replace with-in the last 5k

 

[JMDuramaxLB7]

I'd change your fuel filter, it only takes one bad batch of fuel to do it in.

 

[TOMAN]

May need a fuel pump,if your rail go,s under 17,900 it can go in to limp,do you have a pump on it ? You need to put Your Signature up,see below