My r/c will fall on its' face when accelerating from a stop. Sometimes it will die and sometimes it won't but will spit and sputter until I let off of the gas. I have a 770cfm truck avenger on it and I have adjusted the floats and the idle mixture with a vaccum gauge and it still does it. The choke is adjusted properly and is working good. What else will cause ths and what do I do to fix it?