If the gear mesh was loose that could cause a problem. When the engine at idle does it act like is about to die.
oh when, its at idle its fine i mean when im at my pit table i go almost full throttle and than hit the brake and let it idle and it drops . so im guessing my gear mesh keeps on getting lose.. for some odd reason so i guess than it can make it like its lean bogging when i hit the gas while im getting pit ?