boughy used trex 2008 from frind ran ok but had a miss at mid speed changed plugs air filter element stock fuel filter and fuel pump it was bad rear carb pops so i took off rear carb to clean and pilot screw was all the way in tried to adj with it running no change ran better with it in cleaned carb in carb cleaner no differance adj valves they were ok accelerates grate no hesitation top end was surging i cracked air box lid and it runs fine at top end but still misses at low speeds in cruse mode went bigger on pilot jet it helped idel no pop right off idel still pops and runs bad at low and mid range any ideas thanks