Can someone let me know what the heck is going on with my stupid SI i have a 2000 honda civic si and for some reason when it gets hot or warms up the idle will rev up then violently drop rev up then violently drop constantly when im in netrual and its very irritating i had this once before when i had my 1992 hatch that i swapped a b18c into but the reason for that was because the coolant wasnt full inside the block... and so now i wonder what it is for my SI because the coolant is full in the radiator and everything if anyone can lead me in the right direction that would be much appreciated....