Help Needed Possible new truck

Hey guys. I am looking at a 99 7.3 manual trans truck that has some upgrades...

Afe intake
Possible turbo?
Air raid filter and intake tube
Ram air hood
Banks boost brake
6 position switch? Not sure what brand... any advice to find out which one. 4q
Position 2 is high idle at 1k
Has banks iq unit but doesn't have egt...
Truck drives strog. Builds well over 20lbs on boost and coal is rolling.when you lug the engine.



Potential concerns...
The idle is a bit rough in some modes. Sounds almost like it has a big cam... what could this be? Bigger injectors? How to tell

I ran an autoenginuity test and contribution test came back with cylinders 1 3 and 8 codes and 2 intake heater circuit "a circuit low" and "control circuit"

It runs great and starts right up so I am pretty sure it is not down 3 cylinders. Little smoke when cold started

Please help me diagnosis whether there is any issues.

I also got a glow plug test failure with the 2 intake heater codes...

If I get the truck I will add regulated return, fass fuel system, egt, Pyro, better gauge system the banks iq.

It sounds like mine and it a a tuner on it from Swamps.