07 Chevy having power failure?

The issue is in the ABS system; The power reduction is being requested by the ABS module. When it recognizes a fault with an ABS sensor or the steering centering sensor, and it can't correct the issue on it's own, it will ask for the reduced power from the ECM. Have your ABS module scanned by someone with a Tech2 scan tool to verify where the fault is. Sorry you wasted your money on the Throttle Bodies but glad you asked, before wasting more time and money. No Worries.