120 hp tune, p0299 and glow plug light

Predator u7186, running 9r08, 06 LBZ 2500HD

I installed the 120hp tune recently and upon starting it, the glow plug light would not go out until I started the engine. (When engine warm, light does not turn on. Only on cold engine) I was a little worried something might go wrong with this tune at this point, but pressed on having good experiences with the other three tunes.

After running tune for 4 days, noticed a lot of engine lugging, rough idle, turbo spooling way to fast for throttle position (engine seemed to try to build boost with no throttle input, 1# to 20#s with no acceleration 45mph, egt around 650) I was driving home today and the turbo lit off again, I saw 18#, then promptly dropped off back to 0#. Truck was going down hill with very little throttle input, 1500 rpm. CEL came on, stopped at the local NAPA just in case and read the code, P0299 Turbo underboost. CEL came on AFTER turbo dropped from 18-0#s. Predator cleared the p0299 code and installed 85hp tune with no problems, truck runs great now.
This is the first time I've run the 120 program and will probably be the last. 45, 65 and 85 run great. Engine idled very rough; odd, random boost inputs with no rpm or mph increase; hard shifts, and a lot of black smoke. No intercooler boots blown or leaks in system to my knowledge.

What's up with this?

06, LBZ, 33k mi, stock air and fuel, MBRP/DE exhaust. No boost stick. EGR blocked and finger sticked, PCV rerouted, egr and boost gages.

Any thoughts from the expert tune writers?

[mikel]

This is a new one to me. I have never seenan issue like htis, looks like something on the truck, maybe wastegate related?

Never heard of that also and I run a '07 LBZ using the 120 tune for the past 40,000 miles.

I've never heard of a wastegated VVT turbo...

Has anyone had problems similar to mine with any tune? See first post.

Thanks