My buddy has a nitro rush with a xtm .18 in it. And we can not figure it out it starts real easy but when you try to rev it up it bogs and sputters and some times shoots raw fuel outand then dies . I have tried to lean it out and richen it up and still the same thing. We have checked the tank for leaks none has new silicone hose on it. I have taken the carb apart and cleaned it 2 or 3 times. The car sat for a year or so with fuel in it so I took it all apart and cleaned it twice. The motor only had about a half a gallon through it. And it has good compression. I have sealed the motor and checked all the o rings on the needles. Any suggestions. Thanks in advance.