i have a 91 da i bought from a friend and the rpm jumps pretty fast in between 1000-2000 rpm. I unplugged the iacv and it jumps slowly from the same to like 3k rpm. What should I do to try n fix this problem? I dont want to buy a new iacv until i find out that thats the problem with the car..its a b18a1 with a 99 ls head but has the original 91 tb and im. Please help thanks..