Well this is baffling. While fuel is being injected, the voltage drops to around 12v. As soon as fuel cuts off, voltage goes back to normal. WTF?

https://youtu.be/IaYRGwnVsso

 

Voltage regulator?First, I would try some other way to monitor battery voltage.Weird that when battery voltage goes up to 14.1,that the AFR goes to 29?AFR can never go to 29,and battery voltage at 12V is not good.Makes Me think that display,or sensors have a problem.

 

The AFR going to 29 is just indicating that fuel has been cut. 29 is just the highest value that can be displayed. In additional to the voltage change, you can feel a pretty significant clunk when fuel is cut. This started happening last week when I replaced the lower intake.

https://www.youtube.com/watch?v=IaYRGwnVsso

 

Didn't realize that You had made so many mods.Strange that changing an intake could affect current draw.Good luck in Your search for the solution.