I have a new trx 3.3 in my nitro slayer pro, only has about 2 qts through it including break in. Break in was done properly and has been tuned correctly. I can't seem to get it to hold an idle without the rpms increasing and the truck will move forward if I'm not on the breaks constantly. If I try to decrease the idle via the idle screw it dies, it's all or nothing. Any clues as to what the problem is? I'm hoping to make it to my first race Sunday. I'm semi new to nitro. Thanks in advance.