i have try everything that i know of when i accelerate slowly with steady throttle right jug just stop firing, it happen at about 25% throttle and stays unless i yank the throtle then it fire back up ,if i just gun it all the time it wont happen, what i tried i switch spark plug cable , clean and switch read valve, and i am running a trinity stage 4 pwk 38 airstriker single carb, what could be causing this ????