No problem were always here to help. Your plug is correct the only other thing we see from time to time is if your running wild cat or magnum fuel some kind of additive they have does not agree with our engines. Again this is not a knock on wild cat or magnum just a suggestion. It does seem as if you have some kind of issue with the fuel line sometimes using a thiner fuel line helps as well. Anything that Dubro carries works real well. Lots of luck hope you get your plane off the ground soon.