hi. i have the rush evo with the t-15 engine in. im trying to tune it and have set it to factory settings. but whatever the needles are set to it stalls. i have to keep revving it just to try and stop it stalling it seems to stall all the time[:@] i think its the low speed needle thats playing up i have set it flush with the carburettor and 1 turn inwards e.t.c. but it still stalls at idle.