Pablo, I could use your help

I am having two (2) issues with my truck. The truck is a 2007 VN 670. It has a Cummins ISX 400 engine. The issues are, 1, With a moderate to heavy load and starting a upgrade, I start to loose speed. When I drop down to 60 MPH the truck developes a hick-up and blows a puff of smoke out the exhaust. this will happen until I drop a gear then it stops. It will do it every eight seconds. It even does it on a small hill.
Would that possibly be the EGR Valve?
The second issue is the turbo. I can hear it spool up but not much power. At times while climbing, I will suddenly get a boost of power but it just last for about a second. I don't have a boost gauge so I don't know how much boost I have. At times, it seems like I have no turbo at all. The turbo is a HOLSET brand. What is your opinion on these issues? I appreciate any help that you can offer. Thanks for your time.

 

These are the fault codes with key on engine off. Engine ECU= MID 128, SID 251 and FMI 2. Brake ECU= MID 136. SID 89 and FMI 2. Vehicle ECU= MID 144 and FMI 9. Also I want to include that the truck has a 13 speed trans. I also checked the codes after starting the engine, same codes. The current scaled weight with the load that I currently have is 79400.

 

Pablo, thanks for the info. I will check the fuse in the battery box now. I found my steering wheel crooked when I got my truck out of the body shop in Oregon. They said that they did an alignment due to front end damage. I got it out just before they closed. Had a load waiting.

 

Pablo, I located a 30 amp fuse and a 10 amp fuse in the battery box. I was not sure which fuse you were talking about, so I changed both of them. I did not see any corrosion anywhere. Was the fuse pertaining to the turbo or the possible egr problem? Please advise. Thanks again for your info. I will find out tomorrow when I crank back up for my delivery.

 

Pablo, I am currently running a Pittsburg Power zero back pressure muffler. Would this have a negative action on the turbo? I read in the Cummins book that the Turbocharger Control Valve uses exhaust back pressure. The muffler provides no back pressure. John