stalls,wont go when push gas, lights go on and off and dim, mcaninc cant find wy on 2005 Chevrolet Aveo

i have seen many posts with same issues many say it is the fuse / relay box under hood. does anyone know how to fix these issues please 4 mechanics cant figure it out 1 was supposedly electrical specialist!!! HELP PLEASE SOMEONE TELL ME HOW TO FIX

Asked by for the 2005 Chevrolet Aveo
Check the vehicle grounds first. Make sure all are tight and not corroded. Then check all the fuses. Then, if they all are good, replace the Underhood Bussed Electrical Center (the box with all the fuses and relays). There have been some issues. Has anyone been trying to open the UBEC or do any testing on it?