CM871 losing power

[victory26]

(09-09-2017 )Waterloo Wrote:  You had the ECM reprogrammed? By whom? And how do you know you are running THE @m*m^2 program, who installed that? Sounds like another bad tune. More info please. And these shops you have taken it to, did they upload anything to the ECM?

The guy that had the ecm work done told me that is @m*m^2 . He works at a shop Grayslake,IL. These shops I took the truck to did not touch the software.
The weird thing is that truck does just fine for a short time after ecm is being reprogrammed, then power is decreasing .