Brad Clayton

Your MAP sensor is not reading any pressure in the intake manifold, you should be getting some sort of code out of the PCM to indicate this. I would try to tackle one issue at a time here and put a low pressure gage in-line with the MAP signal hose, command the RPM to 1200, close the EGR valve, and ramp the VGT to 100% or as high as it will go. Then compare the reading on the gage with the MGP pid and see if they match. If they both show a measureable amount of boost but the MAP sensor still reads atmospheric pressure then................

E-boxes are a little stranger when diagnosing compared to trucks. You probably are running out of fuel at the injectors. Will this idle in park ok? If it starts loping and running oddly (fuel knock) after idling for a bit, you could have combustion gasses displacing the fuel in the head. Does this thing have a steel fuel tank? If so it could be experiencing a delam issue and clogging up the fuel system. What's the miles and hours? If they are astronomical, then I would get a quick reading on crankcase pressure before heading any further. All the above items are easy to check and thus eliminate as possible causes.

I spoke with Greg and he said:
 
 
It seems the PCM was altering the cam signal whilst tryiing to get to the FICM.