Found the root of the problem. It appears the crankcase vent heating element that attaches to the intake manifold must of corroded and shorted out which burnt wires, throttlebody, manifold and DISA's.

I found some posts that this happened to other N52 engines as well.

Crazy...

Here's the part: https://www.turnermotorsport.com/p-3...uine-bmw-part/