Their are many possibilities. the low end is off or their is junk in the lines. You didn't say what really happens whe it dies at idle. Does the engine speed up or slow down. If the engine speeds up then the low is lean. If it slows down and dies then the low is too rich. If nothing happens then check for crap in the carb. The idle adjustment is only to get is running. You can adjust it a little to keep it running. All nitro engines run at different temperatures around the world. Temperature readings are good for a geaneral range starting point.