Originally Posted by vanliktenstein

well it could be a maf being dirty of engine coolant sensor taking a shit my car will do that about 2 to 3 times a month i also have an intake and it didnt make the car much faster it did make a difference at like 5600 rpm to 7200 rpm it kept pulling i noticed stock ka's die out at about 5700 rpm i would say to check everything for wear think it of this way the only things that would make it change is AIR, SPARK, FUEL good luck is it dual overhead cam or single