I’m working on a generac ultra source 15000. The initial issue was that the idle control was not working, it would start and rev up extremely high. Tested and found the control board to be the issue. Replaced control board and now can hear the idle control motor moving but generator won’t start. I have spark for about 5 seconds then it drops off. The start stop relay is cutting out. Replaced that as well, no difference. Tested all parts of system using service manual and it’s showing the control board is bad. So I ordered another to try. At first it had good spark and was trying to start, but now spark is dropping off after 5 seconds. I can put the original board in and it’ll start but rev super high. So it’s acting like something is shorting these new boards out or I’m missing something. Any help would be greatly appreciated.