Help please. I bought a 3w 75ius off rcu. I am having trouble getting it tuned right. it is turning around 5900 on the ground with a bolly 25x10 prop on 75 to 1 amsoil. It idles at 1900. It has a couple of problems. the transition is good on the gound but when i go to take off it sputters like it is going to die. luckly it doesn't. also at 1900 at idle the plane moves on ground quickly and i cant get it to slow down on landing. my needles are set at 3/4 on the high and 1 1/2 on the low. What do you think?