3406E warms up looses boost ?

[Heavyhauler]

I would say that it is well over 8 years old. The truck itself is a 1998-1999. We have had a few different people tell us that if the ECM had any issues it would throw codes. Which I think they could be correct as well in most cases. But I'm skeptical of the ECM with no evidence yet. Rocky hill can confirm the ECM age, we went up and picked the truck up used together.