Well, I spent time yesterday to check the throttle operation. I looked at the servo, the travel, and made sure no obstruction interfered with its operation. I also changed switch positions on the radio also while trying the throttle operation. Also double checked the manual choke movement and it was fine. So far no problems found.

Next step will be to remove the engine to look at the butterfly and to inspect the fuel lines. I have a 3 line system, fueling line, carb, and overflow. I may rework the tank and lines into a 2 line system to cut down on the possible failure points.