Hey, I've been my superstar EP for about a year or two now and I just purchased my first glow plane: The AVISTAR SELECT RTF. When I first got the engine I broke it in and then had an experienced modeler look at it that has had glow experience for 40+ years. He took the plane up for me on about 3-4 flights and made sure every thing was working ok. Every time we would get it off the ground and a couple hundred feet up the engine would die out(it's the O.S. 40 LA), the tank still would have 1/2 a tank in it, so after that day I brought it home and checked for any problems, I replaced all the fuel line except what is in the tank, but after doing that I noticed a problem with the needle valve- it had a crack in one of the connectors that went to the carburator. I called Tower Hobbies up the same night that I found the problem and they sent me a new needle valve assembly free(that's good customer service) Last night I tookk the engine out and put the new needle valve assembly on and got every thing adjusted, now just earlier tonight I took and tried to start it- it runs just fine up to 1/4 throttle and if I try to give it full throttle, it just dies out imediatlley and also the plane shakes severly (same problem it had in the air before) The needle valve I know is set right so what else could it be- I hope to take it up this thursday during MEA break- but not the way it's running- any response ammediatly is always good-thanks-but if after thursday just keep responding because if the problem isn't solved by thursday I will still work on it over the weekend