Mario Kart PC Forum - Advanced search

so i will admit that i am new to this version of mariokart, but i have played other mariokart games, but this one is the best one i have found so far. my only issue is when doing grand prix that the computer players(cpu) get random bursts of speed and pass my up with ease when i get a huge lead away from them. i originally thought they got some item like the mushroom or something but there were no item boxes anywhere near them after a thunderbolt went off. i am just posting this in forums to maybe get some answers of what to do for this if i can, cause i do enjoy playing, but not if it is unfair against me in those occasions.