I got this motor and was supposed to have only 15 min of flight on it and from the looks of it, it is true. But, I have it on a spacewalker (GP I think) and it wont run steady. It will kinda go up and down slightly in rpm while at full throttle and when I come in for a landing it will just die as soon as I let the throttle to idle. I have had lots of 4 strokes but none this bad off. I have put a new fuel tank, fuel line, 2 to 4 new glow plugs or thereabouts, and balanced the prop. But not the nose cone. I caint figure it out. It appears to run fine on the bench but it has been a while since I have ran it on a bench so I caint remember it. Anyone with this same problem? Thanks.