I've got a new G38 with a C&H electronic ignition that I ran for the first time this afternoon and I'm having a bit of trouble with it. It starts just fine but has very limited throttle response even after it has warmed up. It runs well at about 1/2 throttle but will not respond as I open the throttle and dies if I start to close the throttle. I've reset the low and high end needle valves per the manual but with little effect. I'm scratching my head but not getting anywhere.

Any help is greatly appreciated.