I have a Honda GX620 driving a 10000 watt generator, the only way I can keep it running is to keep choke pulled slightly out. It will die if I push choke fully open and put even a small load on it. but if I pull the choke out and kind of set it to run good it will run. It has the automatic solenoid that reacts to the load and rpm and surges? Any ideas why it would surge with choke fully opened?