i have a stock Tamiya/OS FS-18SR engine in my Tamiya TNX. When i start it, and so the engine is cold, it runs very, very well, like wheelspinning on tarmac. then once the engine warms up to temperature it starts to be very hesitant and jerky at low throttle and difficult to get up to speed because of the hesitation, especially when accelerating from idle. I am using 22% fuel, with a duratrax silver sport plug.

Any help is appreciated.