So QED system newly installed and running pretty much OK, will be RR'd before used in anger. Now I've got one niggling little fault, doesnt matter in practise as I won't use it but if I switch to closed loop the engine stalls almost immediately. The ratio settings have been tried at 13.5 and 12.5 to 1. I also increased the revs to 2000 before switching to ensure it wasn't a slight drop off on tickover that does it. Any ideas???