has anyone actually set up the management?

i would get yourself a copy of a book by dave walker all about engine management systems.

start at the beginning from the very basic stuff. that way you'll get to know the car inside out, and know what has been done and what hasn't.

what management is it running? have you got the software? have you got a backup of the file? the person who made the car should know all of this, but it sounds as if they just bunged all this stuff on and haven't had it set up properly.

get the book, start from there as it could be too many things