Hi, Thanks everyone for all the help. Today I took it back out to the field and took it up and ran it and it just kept on running and never did die. I brought it down and it was almost dry. I flew 3 more tanks through it and never once did it even cut out. I think it was vibrating due to loose engine mount screws and it needed a new prop and the clunk was bounceing out of the feul and causeing me problems.