Hilborne
When does it cut off? Just sitting at idol? After a pass? I have a Hilbourne Injectionn System also and mine does it sometime after a full pass but I also have not done some final tuning either. You can call Ernie at Hilborne in California and he might can tell if it is in the tune up or not. Maybe this might help some. I had a hard time getting mine close to being right and with out the guys out there I would have sold it by now but oncce you get there you will like the system.
Ray