I have a Traxxas Nitro Rustler with a TRX Pro .15 engine that seems to bog down when I accelerate. I have tried to set the mixture all different ways, tried a couple different fuels, new glow plugs, looked for air leaks, changed fuel lines and checked the piston and liner for compression! It does it at about half throttle and sometimes dies. Ican't see any difference when I lean or richen the fuel mixture. Also I can't seem to tell if I am too lean or too rich. Anyone ever run into this? What did you find? Any help would be appreciated.

Thanks