here is my latest update... the engine seems to have nice response and it idles... I can open up full throttle from idle to wide open without issues... now comes the problem... I am at full throttle and I bring it down to round about mid... then the engine stutters... it hesitates to go back to full throttle, this will make the engine cut in air... so I didn't try fly it... in other words its good at idle and good at wide open... if I gradually increase throttle from that mid position it struggles... don't want my engine dying when I am doing a slow low pass and I want to open it up to pull me back up and it cuts... what could be the problem here?