hey guy i have recently swapped a b18b into my 96 hatch. when i first start the car up when its cold the rpm's shoot up to like 2100-2400 then when it warms up it drops to 1600. when i shut it off and restart the car it will be at 800 where its supposed to be. ive searched and found nothing to help me out. Q: how do i fix this problem and what are the causes of this? thanks in advance to anyone who helps me.