You need to check the whole system. It could be something as simple as a fuel cover that doesn't seal completely or a loose gasket on the exhaust manifold. It's all part of the pressure needed to keep the fuel flowing properly.
Make sure the cooling head is snug and the same for the glow plug.
It needs to be properly tuned before you can accurately set your shift point.
If you can't make it run with a correct tune, then you have an air leak somewhere in the system.
https://www.rcnitrotalk.com/forum/threads/nitro-tuning-tips-and-tuning-flow-chart.60832/
Before you try making any adjustments it needs to be up to proper temperature. Lean the LSN just a little at a time. See it as a clock and don't move it more than an hour. drive it slowly, then accelerate it till it clears out. Bring it to a stop and give it full throttle.
Did it seem to...